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若,则b的值为A.16B.17C.18D.20
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若
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMIAAAAZCAYAAABjGPHdAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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OtGyZRmDsSkH87f+BbljRCb0MpYNU4CBIENkawYUawltbxYG2aXOai6+HBIEYhkfalSLfYJg+VcD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CgAAAABJRU5ErkJggg==
)
,则b的值为( )
A.16
B.17
C.18
D.20
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