Who's that girl?[ ]
A. She's my mother
B. He's my father
C. She's my sister
答案:C
简述柴油机进、排气阀槽臂脱槽和导杆折断时的查找方法?
在一个电气连接部分同时有检修和试验时,可填写一张工作票,但在试验前应得到()的许可。