选配装配法可分为:间隙选配法、过盈选配法、过渡选配法。()
参考答案:错
— Listen! Someone is singing in the music room. It ______ be Jim. He practices singing there every day.
— It ______ be him. He has gone to Beijing. [ ]
A. can; can't
B. must; may not
C. must; can't
D. may; may not
横担定位在电杆上部,用来()。
A、支持绝缘子
B、支持导线
C、使导线间满足规定的距离
D、水泥横担