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下列事件是必然事件的是A.直线y=3x+b经过第一象限B.方程的解是x=2C.方程=-3有...
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下列事件是必然事件的是( )
A.直线y=3x+b经过第一象限
B.方程
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFAAAAAjCAYAAAADp43CAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
的解是x=2
C.方程
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAASCAYAAABM8m7ZAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEASURBVEhL7ZS9EcMgDIU1FwXjuNcm1AxCq0Fc
MIoigXEOR+THZ1OFuxSRQY/vwQPYGADAt/9Gwlb9yhr8hdUBPd/rR+bogZFq5+usJtybWpvO0Reg
ucI5Mkb6kVhISrR85FxQiLH7v/ENicVi1LWnrNZFnmNWURTpOgjf5b3OI9R1OvuUsCwrZ/QUfTlH
i7irnRQWZfa73cb1MYRHjnixADgt2/O47N2sOJEQe2i2fSfczzoQp5TK9+CAXVhrxg45Vps1BkpQ
4vDRVjNQg1tdyCt1E25WqTXbbarutDBa/Ye1N2e8SFOlvufl6nfUvVxrcAwuzBfWPSn1dOJmxgzh
BweiTHWmaY0xAAAAAElFTkSuQmCC
)
=-3有实数根
D.当a是一切实数时,
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAAbCAYAAACX6BTbAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEvSURBVEhL7ZTBEYQgDEVTlwfK8U4nnCmEK4V4
oJRsAiIgqDjgbZndmd2oP9/HJ4CNBQA45Xsl3qq/rcFfvElgChYrUwCkPSTHmTuNIgryb0qa0M43
GBZ31mKQCstpgSC0rw2LV1gZ0Vfi7HwaltK5Rbm7nsI8F7dSYsrKROaMI0vhnLR4FdrEyDn+50bD
afHRq6ZowDMs3jrhsfZK3Mo458kZ5/kM+dSpU9yhFulYE2SUhOJBuw8LOy42jA63FgL3EXJJ5tk5
D6PsYOwDpK41WgCadd/t9bjMu58Potr1+U3a5sEY46+oBXBRWwh/Jl4iCawBGIlD+tyuZNG/QXCf
i9MM9TM6ZJnzmzfoFaf7VhJg94X4/fOdzum2TS0Ii/pGnG2w+0+cH8c229ABKvgDjkWhiDuJCKAA
AAAASUVORK5CYII=
)
=a
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