销联接在机械中主要是定位、联接成锁定零件。有时还可做为安全装置的过载剪断零件。
参考答案：对
It is known to all that every minute ____ full use of _____ the lessons will benefit students a great deal. [ ]
A. which makes; studying
B. when made; to study
C. that made; to study
D. when is made; studying
模拟信号的数字化需要（）个步骤。
A、2
B、3
C、4
D、5
