蒸汽锅炉的燃烧器电机不运行原因是()。
A、电机过载断路
B、接触器故障
C、电容器故障
D、燃烧器电机故障
参考答案:A, B, C, D
No sooner ____ to the cinema ____ the film began. [ ]
A. had he got, than
B. he had got, when
C. did he get, than
D. had he got, when
读我国跨流域调水工程分布图,回答下列问题.
(1)写出图中跨流域调水工程的名称:A______,B______,C______.
(2)C工程沟通的水系有______、______、______、______和______.
(3)C工程建成后的主要效益是:a解决______地区缺水问题;b恢复______运河北段的水运能力.