题目内容

俯视图中螺纹孔3XM4-7H的加工深度为（）

A. 3
B. 4
C. 5
D. 7

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You are not allowed to leave baggage here as the aisle mustn’t be () .

We have to keep the aisle ().

Please don’t keep your luggage in the () or at the () .

You can put the baggage in the () or under the seatin front of you.