题目内容

电能用户的用电设备在某一时刻向电力系统取用的的总和，称为用电负荷

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由于不可能对所有的用电单位和用电设备都采取相同的供电措施,所以供配电设计应首先对用电单位和用电设备进行负荷分级。负荷分级应根据用电单位(即电能用户)和用电设备的、、及其在政治、经济上的重要性进行确定。

ideas don't drop fully formed from the skiesThis means that ideas ____.

A. need to be developed with careful thinking
B. are immediately created through good teaching

in the long runThis means ____.

A. at a time in the future
B. with a great deal of effort

frighten the life out of someoneThis means ____.

A. to make someone very ill
B. to make someone extremely afraid and nervous