单项选择题
A.0.5 B.0.1 C.0.15 D.0.2
A.1.5 B.2 C.2.5 D.3
A.0.01 B.0.02 C.0.05 D.0.5
A.W=G+(0.2~0.3)Q B.W=G+(0.4~0.5)Q C.W=G+(0.3~0.5)Q D.W=G-(0.4~0.5)Q
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