单项选择题
A.10% B.20% C.30% D.50%
A.168000N B.168500N C.168100N D.168700N
A.18375N或18031.4N B.617.0N C.618.0N D.617.5N
A.565.9N B.16600.3~11448.5N C.566.0N D.570.0N
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