A.監(jiān)護員、操作員、監(jiān)護員 B.操作員、監(jiān)護員、操作員 C.監(jiān)護員、操作員、操作員 D.操作員、監(jiān)護員、監(jiān)護員
A.120N B.100N C.140N D.160N
A.1-20 B.3-35 C.5-35 D.10-40