当故障造成动车组无法运行并（）失效时，随车机械师应及时通知司机请求救援。
参考答案：全列空调
The big snow caused great ______ to the people living in the south of China, ______ some of them homeless.
A．destroy; left
B．damage; leaving
C．ruin; having left
D．wound; leaving
热风焊接法
