郑州地铁一期工程在主变电站油变压器房设置有自动水喷雾灭火系统。
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Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.
A. a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine
B. a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine
C. two medium-speed, turbocharged, four-stroke diesel engines
D. a variable-speed AC generator
所有政党要想获得执政地位必须具备的两个条件是自身的力量、群众的态度。
A. 正确
B. 错误
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