单项选择题
A.0.1 B.0.2 C.0.3 D.0.4
A.0.07mm B.0.075mm C.0.08mm D.0.085mm
A.1000 B.1050 C.1400 D.2000
A.LRB400/31.5V B.HPB315/10A C.KPB315/16A D.GRB315/31.5
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