金属板某一处受到拉伸后,它的金属晶体将互相靠近。
参考答案:错
回采工作面超前支护距离不得小于().
A、10米
B、15米
C、20米
Because of the limited time,he didn’t go into details on the subject. He only spoke ____. [ ]
A. in common
B. in general
C. in particular
D. in public