千分尺的螺杆在螺母内()时,通过螺纹的作用使螺杆产生轴向移动,以改变测量之间的距离.
A.摩擦
B.移动
C.滑动
D.旋转
参考答案:D
In China, those who want to enter universities have to _______ the entrance exams in June. [ ]
A. check through
B. work through
C. look through
D. go through
路基处理的方法中,适用于黏性土、冲填土、粉砂、细砂等土层的是()。
A.排水固结法
B.振密挤密法
C.换土垫层法
D.置换及拌入法