一般息止间隙的平均值约为A.3~4mm B.4~5mm C.1~2mm D

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问题 一般息止间隙的平均值约为A.3~4mmB.4~5mmC.1~2mmD.2~3mmE.5~6mm

选项 A.3~4mm
B.4~5mm
C.1~2mm
D.2~3mm
E.5~6mm

答案 D

解析
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