题目内容

You’d better keep your left hand under the table unless you use it in the ______ of cutting.

A. meal
B. course
C. process
D. while

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If you are not able to accept an invitation to a dinner, you should ______ in good time and not at the last minute.

A. not come
B. refuse
C. show
D. decline

基准不重合误差是由定位基准与它不重合引起的,它是:

A. 限位基准
B. 工序基准
C. 设计基准
D. 装配基准

基准位移误差是由定位基准与它不重合引起的,它是:

A. 限位基准
B. 工序基准
C. 设计基准
D. 装配基准

当定位基准的变动方向与加工尺寸之间的夹角为α,δi为一批工件定位基准的变动范围。则基准位移误差ΔY为:

A. ΔY=δi×cosα
B. ΔY=δi×sinα
C. ΔY=δi
D. ΔY=δi×tanα