单项选择题
A.3 B.1.5-3 C.5 D.10
A.0.035 B.0.024 C.0.15 D.0.015
A.0.38δV/B B.0.24δVB C.0.12δVB D.0.38δVB
A.0.1 B.0.8 C.0.3 D.0.2
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