首页
如图所示四种简单机械中,属于费力杠杆的是A. 天平B. 火钳C. 钉撬D. 老虎钳
试题详情
如图所示四种简单机械中,属于费力杠杆的是( )
A.
![](https://img.xintiku.com/upload/b7/b1/b7b162326c16588269eb13f2315ea7b5.png)
天平
B.
![](https://img.xintiku.com/upload/a8/7b/a87bd430ca635f78a1bf7e5f86504dce.png)
火钳
C.
![](https://img.xintiku.com/upload/89/5f/895f8813fdf3b3920e6400b4520114cd.png)
钉撬
D.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACMAAABDCAYAAAAWLbwDAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳
相关试题
-
如图所示四种简单机械中,属于费力杠杆的是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHIAAABDCAYAAABA+1F1AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
天平
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAABGCAYAAAAzbZETAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
火钳
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGsAAABCCAYAAABQHCjyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
钉撬
D.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAABPCAYAAACd+leyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳
-
如图所示四种简单机械中,属于费力杠杆的是( )
A.![](https://img.xintiku.com/upload/b7/b1/b7b162326c16588269eb13f2315ea7b5.png)
天平
B.![](https://img.xintiku.com/upload/a8/7b/a87bd430ca635f78a1bf7e5f86504dce.png)
火钳
C.![](https://img.xintiku.com/upload/89/5f/895f8813fdf3b3920e6400b4520114cd.png)
钉撬
D.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACMAAABDCAYAAAAWLbwDAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳
-
如图所示四种简单机械中,属于费力杠杆的是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHIAAABDCAYAAABA+1F1AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
天平
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAABGCAYAAAAzbZETAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
火钳
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGsAAABCCAYAAABQHCjyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
钉撬
D.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAABPCAYAAACd+leyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳
-
如图所示四种简单机械中,属于费力杠杆的是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHIAAABDCAYAAABA+1F1AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
天平
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAABGCAYAAAAzbZETAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
火钳
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGsAAABCCAYAAABQHCjyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
钉撬
D.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAABPCAYAAACd+leyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳
-
如图所示四种简单机械中,属于费力杠杆的是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHIAAABDCAYAAABA+1F1AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
天平
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAABGCAYAAAAzbZETAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
火钳
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGsAAABCCAYAAABQHCjyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
钉撬
D.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAABPCAYAAACd+leyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳
-
如图所示四种简单机械中,属于费力杠杆的是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHIAAABDCAYAAABA+1F1AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
天平
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAABGCAYAAAAzbZETAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
火钳
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGsAAABCCAYAAABQHCjyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
钉撬
D.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAABPCAYAAACd+leyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳
-
如图所示四种简单机械中,属于费力杠杆的是( )
A.![](https://img.xintiku.com/upload/f8/61/f861f42ff500c6a95689e4653d54deec.png)
天平
B.![](https://img.xintiku.com/upload/10/e5/10e5720aed9f107083847ff8000e871b.png)
火钳
C.![](https://img.xintiku.com/upload/5f/ee/5feed6b1604274f763260660fb7a8d30.png)
钉撬
D.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACMAAABDCAYAAAAWLbwDAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳
-
如图所示四种简单机械中,属于费力杠杆的是( )
A.![](https://img.xintiku.com/upload/df/c6/dfc6ac563722bf107eb0071fe9e2b23c.png)
天平
B.![](https://img.xintiku.com/upload/9b/2b/9b2bf202ecc56191478c5e330ca17896.png)
火钳
C.![](https://img.xintiku.com/upload/e0/38/e03863c317de7cd9d5c8a3ecabb07bc3.png)
钉撬
D.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACMAAABDCAYAAAAWLbwDAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳
-
如图所示四种简单机械中,属于费力杠杆的是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHIAAABDCAYAAABA+1F1AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAQQSURBVHhe7VyLbsMgDOz//3SnPdIRZHNnYxIC
njRtS41j3/kFzfp659cSCLyW8CKdeC9F5Ov1enu+V4iDJYisyWOJ8a5j9V8ptxSRJXDfJH1/HT/L
38trx/X62pUkRNxrGSIPMCRCjsyrASvJTiIjwilAR4sIjcgW+QEmXapiiYysS6iUeYjoS1EfcLMk
suqjAzC+RGUSmUReEmj0TVpbCalHrrT1+GktNFIPE0QHAw9zB5q7LJH1vlHaV0J0HiSQRD6IrJap
SWQSOT8C0snN009wNNQzI+ePR8rCJJKCaX6hJHJ+jigLlyWyPATQfqcQeojQ0kQeHNQnOysOPEnk
QzIOmfkhEh1p3fk6ckJ6vX4yQHpSwKr3TgzgvbXyY3VyhDx6Q7h50vH3qMdxVBdJ5AhfvTo/BJcK
IOvOp9R69XqcHJGRZVD0+hS+vgapJws8gKsnFX9B49EpDTctYq33mBEjcdi587268t5WgOuMaU2t
vWTMhpE6tWqp7wEXrYkERSKIvYbs1KpXpP2oQmkBSG0/okmV9FlBRA5LvR9d67HhbowoItlItDTw
HtDQtHr0wxa4vaUV2W/BIiIIXEQy2VAOF8jpyNdRj72iDDKBFm1HCJER0RetwwNmtA2svohApohE
Pa0sUygjIoxmKsLI+/Tqjs7Gn2mdMcpLJBuRq8qhgIvs0yciEaD1vkzKvjszst5HtvxhAtgjgzCU
slGbJyyZO5TIyIhjQLWCOHIgawV0jQtrd7PvS3ur1jiMRuUIoxjSJBm2GrByEXZIwaxlZSsDUXUJ
65FM2S1lvCCx02iEnNdGy0xR41a3hxaupyGTMZYxLIn8R5LBq64KPZWOnloR2aic1uuR/A6vS4MZ
anN0j0SEseXqlPLKe5i10drf9UBS/q31H1b3AWb5Uyv/LTuY9T0kMbxQPZJRpEUYMxkislok9wJ8
rI/Sw84B0QNXKJFSo0a1nw2S0XIo4NDrFvuiSQzrkdayEQmKBcBZZFvbDK+NQzNS6mFSCd5huEH7
QC+Bn1Leq0BaX/adq0qrNxhG+M/ojC6v4RlZT4JXlVEt+zVQrfIMORaZJFJBy0qMVd5CEiM7BZHe
Mpbr+E+vZILhNGSaF3Q8b2q9167ynnZk7pGem+xKiNdvT9k3Eem5gdeZ3ddZsaaJtCrenYhe/614
U0RalfY6ket/EbDgDom0KEsCYhGwYN8kMnqvE+vmHtpYMql/4tkDsnm9ZMiE/1Y3r3v7WMZUxubj
kPtANb+nKCtNz7XmERt/xDYKKy3kxE/1mD8+97SwlZVJ5INiwkzkqLKQemNKsxR7p4xkghM1XUZH
ypwRsAY4JNKiMMmIQ8DyjpImC4/o4sxNTerEafwgqmZGJsz3IWCphFpGfgF/8klDWmdDSQAAAABJ
RU5ErkJgguiPgeS8mOe9kQ==
)
天平
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAABGCAYAAAAzbZETAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
火钳
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGsAAABCCAYAAABQHCjyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
钉撬
D.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAABPCAYAAACd+leyAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳
-
如图所示四种简单机械中,属于费力杠杆的是( )
A.![](https://img.xintiku.com/upload/5a/c2/5ac2ea5370b42141daec999ec3d5799b.png)
天平
B.![](https://img.xintiku.com/upload/19/3a/193ae51484d2af6715ded04ca82567d5.png)
火钳
C.![](https://img.xintiku.com/upload/2e/16/2e1636ba85cab01efd00d1a6c08a4674.png)
钉撬
D.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACMAAABDCAYAAAAWLbwDAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
老虎钳