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【单选题】听力原文： The idea of fighting a noise by making more noise sounds strange, but that's exactly what motor engineers are doing in Germany and some other countries. Carmaker's research and development labor...
A.
By mixing high frequency sound waves with low frequency sound waves.
B.
By producing pressure waves going in the opposite direction.
C.
By mixing new sound waves with the noise and sending them out together.
D.
By making copies of the unwanted sound waves and letting them out a little later.
【简答题】The equivalent circuit of induction motor is shown as following figure. A 400V, 60Hz, six-pole, 25hp, Y-connected induction motor has the following impedances in ohms per phase referred to the stator ...
【单选题】在主配电板的负载屏上装有______。
A.
A． 兆欧表、绝缘指示灯、整步表
B.
整步表、同步指示灯、兆欧表
C.
岸电开关、绝缘指示灯、整步表
D.
兆欧表、绝缘指示灯、岸电开关
【简答题】The equivalent circuit of induction motor is shown as following figure. A 350V, 60Hz, six-pole, 25hp, Y-connected induction motor has the following impedances in ohms per phase referred to the stator ...
【简答题】The equivalent circuit of induction motor is shown as following figure. A 350V, 60Hz, four-pole, 25hp, Y-connected induction motor has the following impedances in ohms per phase referred to the stator...
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