题目内容

In recent years, we have invested more in basic science, but I think the investment ratio is still____.

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The ____between consumption and investment must be corrected in order to achieve sustained economic growth.

常开触点也称动合触点，在常态下断开，动作时闭合。

A. 对
B. 错

1、下列元件中，开关电器有。

A. 组合开关
B. 接触器
C. 行程开关
D. 时间继电器

熔断器主要作为电动机的（）保护用。