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【单选题】
下图为交流接触器的工作原理图。当按下按钮7，接触器的线圈6得电后，线圈中流过的电流产生磁场，使产生足够的吸力，将衔铁吸合，通过传动机构带动主触头和辅助动合触头闭合，辅助动断触头断开。当松开按钮，线圈失电，衔铁在（）作用下返回，带动各触头恢复到原来状态。A.
B.
静触头
C.
动触头
D.
反作用力弹簧
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【单选题】The author compares the effect of airliners on the environment and that of the cars and concluded that the effect of the former is less because the number of airplanes is much smaller than that of the...
A.
Y
B.
N
C.
NG
【单选题】To explain the effect of trenches,the writer gives the example of
A.
the sea floor in the Atlantic Ocean.
B.
the Himalayan Mountains.
C.
Europe.
D.
lndia.
【单选题】To explain the effect of trenches, the writer gives the example of
A.
the sea floor in the Atlantic Ocean.
B.
the Himalayan Mountains.
C.
Europe.
D.
India.
【判断题】The price effect includes the income effect and the effect of changing preference.
A.
正确
B.
错误
【简答题】To explain the effect of trenches, the writer gives the example of
【简答题】The effect of governmental expenditures on the total economy varies with both the level of utilization of labor and capital in the economy at the time of the expenditure, and the segment of the econom...
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