单项选择题
A.46656 B.4.6656*104 C.4665.6*10 D.4.666*103
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
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