当209压力开关的下接点不良,使用电阻制动时,会产生以下哪种现象()
A、不能产生初制动
B、能产生初制动
C、均衡风缸一直减压至零
D、均衡风缸一直增压
参考答案:C
— Don't leave your toys ____ aboutwhen you finish playing them, Tom.
— OK, Mum. [ ]
A. being laid
B. being lain
C. lying
D. laying
制空权