题目内容

当变频器的面板灯PU亮,说明处于外部模式

A. 对
B. 错

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更多问题

当RUN灯亮,说明变频器正在对外输出电压电流

A. 对
B. 错

PU模式下,无法调节变频器的输出频率大小

A. 对
B. 错

The word “luxury” in paragraph 1 is closest in meaning to ____________.

A. delicious meals
B. chairs with cushions
C. beautifully set tables
D. a condition of great comfort

Which of the following is not true about the first airplanes?

A. They were very cold.
B. Passengers were not allowed to open the windows.
C. Only men were hired to work as flight attendants.
D. They shook so that many passengers got sick.

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