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提问人:网友张翠翠
发布时间:2023-06-30
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![粗牙普通螺纹螺距是标准螺距,其代号中不必标注螺距。()](https://img2.soutiyun.com/shangxueba/askcard/2023-06/30/1415/20230630080811101.jpg)
[判断题]
粗牙普通螺纹螺距是标准螺距,其代号中不必标注螺距。()
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共位网友提供了参考答案,
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A.M20-5g6g
B.M20×2.5-5g6g-N-LH
C.M20
D.M20-5g6g-N
A.普通粗牙螺纹可不标螺距是因为在国标中没有粗牙螺距
B.一般而言,左旋螺纹都应在螺纹代号后标注LH,右旋不标
C.管螺纹的螺纹代号是G
D.多线螺纹的标记中,应直接注出线数
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