息止间隙的距离为A.2~4mm B.3~5mm C.5~7mm D.7~9

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问题 息止间隙的距离为A.2~4mmB.3~5mmC.5~7mmD.7~9mmE.9~11mm

选项 A.2~4mm
B.3~5mm
C.5~7mm
D.7~9mm
E.9~11mm

答案 A

解析
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