Can you help _____ with _____ English? [ ]
A. he, his
B. his, his
C. him, his
D. him, him
答案:C
隧道工程常用防、排水系统是()
A、初支与二衬间设防水板
B、施工缝、沉降缝处设止水带
C、埋设环向透水管
D、埋设纵向透水管
加工中心夹具选择应注意哪几点事项?