第七章测试1.
What is the unit in Ra6.3?
A:uncertain B:um C:m D:mm
答案:B
2.
What is the most commonly used evaluation parameter of surface roughness
A:Rz B:Ra C:Yn D:Ry 3.
How much is the upper deviation of h6
A:3 B:1 C:0 D:2 4.
What is the fit of H7/f6?
A:clearance fit B:transition fit C:interferance fit D:uncertain 5.
In hole based system of fit, what is the basic devitaion symmbol of the hole
A:H/h B:H C:h D:any letter 6.
What principle does one should follow in set position of a part?
A:machining position B:machining position and working position C:working position D:uncertain 7.
The dimension chain should be closed
A:错 B:对 8.
When represent a shaft, the non-circular view should be chosen as main view
A:对 B:错 9.
The upper deviation is : maximum size-basic size and the lower deviation is : minimum size-basic size
A:错 B:对 10.
we can find the material from title block
A:错 B:对
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