题目内容

In the past ________ , they have had to trade oil for food.

A. ten decades
B. decade
C. ten years
D. ten year

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Rock and Pop music have changed the face of music ________ since second half of the 20th century.

A. dramatist
B. dramatically
C. dramatic
D. drama

下列元件哪些属于PLC内部的字元件

A. Y
B. S
C. T
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E. C
F. M
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三相对称负载三角形连接于线电压为380V的三相电源上,若第一相负载断路,则第二相和第三相负载的电压分别是()

A. 380V,220V
B. 220V,220V
C. 190V,190V
D. 380V,380V

三相对称负载星形连接于线电压为380V的三相电源上,无中性线，若第一相负载断路，则第二相和第三相负载的电压分别是（）

A. 380V,220V
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C. 220V,220V
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