If I had taken part in the 400-meter relay race in the sports-meet, our class _____ the race．I’m _____ weight this year．

A．might not have won; gaining

B．Would not have beaten; putting on

C．can not have defeated; losing

D．must not have achieved; acquiring

列车尾部安全防护装置的主机，应由（）负责安装与摘解。（C、4、X）[05-00-03-05][020204]

A.技术人员

B.列检人员

C.机务人员

D.车务人员