初期支护
参考答案:
初期支护是帮助围岩获得初步稳定,并保证隧道施工期间的安全,以便挖除坑道内岩体的一系列支护结构和工程措施。
---What do you think of teaching , Bob?
---I find it fun and challenging. It is a job ___you are doing something serious but interesting
A.where
B.which
C.when
D.that
电缆终端头处电场比电缆本体复杂,该处()。
A.只存在径向分量;
B.只存在轴向分量;
C.不仅有径向而且还有轴向分量;
D.平行于应力锥方向分量