单项选择题
A.103K2 B.103K5 C.103K7 D.102Q2
A.KL4001 B.BC3150 C.KL9210 D.KL2408
A.M10×70 B.M16×70 C.M20×70 D.M25×70
A.12D B.6D C.10D D.20D
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