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单选题
1216、This document shall specify，for a crack inspection, the minimum size crack expected to be discoveredor, if no minimum is defined, a statement to this effect.
A
This document shall clearly states the minimum size crack you may discover in a crack inspection. If nominimum is defined, it shall have a statement that that the same effect.
B
This document shall specify the minimum allowed crack size expected to be discovered for a crackinspection or, if no minimum is defined, an equally valid standard.
C
C The minimum crack size you are going to discover during a crack inspection shall be included in thisdocument. However，if you could not set forth la standard, a statement Fsha11o take place.
答案解析
正确答案：B
相关知识点：
它有单轴且恒速运转
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