问题
单项选择题
螺纹量规中的通端工作塞规是检验工件内螺纹的（）。
A.单一中径
B.作用中径和大径
C.大径
答案
参考答案：B
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螺纹量规中的通端工作塞规是检验工件内螺纹的（）。
A.单一中径
B.作用中径和大径
C.大径
参考答案：B
| 阅读理解。 | ||||||
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THOMSON HIGH SCHOOL
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