单项选择题
A.10.0 B.15.0 C.20.0 D.22.0
A.40.0 B.50.0 C.60.0 D.70.0
A.80.0 B.120.0 C.150.0 D.200.0
A.2500N B.3500N C.4500N D.5500N
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