单项选择题
A.18.2314 B.18.231 C.18.23 D.18.2
A.16 B.17 C.16.0 D.17.0
A.50 B.50.3 C.50.0 D.50.5
A.4.2*104 B.42*103 C.420*102 D.4200*10
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