题目内容

Young children are often more (energy)____ than adults.

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It is essential that these application forms (sent)____ back as early as possible.

In spite of the heavy rain the workers will try their best to get the goods (deliver)____ on time.

机组由三台机器并联组成,已知各机器的效率分别为0.52、0.75、0.93,输入功率分别为15、22、38kW,则该机组的机械效率为。

A. 0.363
B. 0.685
C. 0.795
D. 0.816

在由若干机器并联构成的机组中,若这些机器的效率均不相同,其中最高效率和最低效率分别为ηmax和ηmin,则机组的总效率η必有如下关系: 。

A. η<ηmin
B. η>ηmax
C. ηmin≤η≤ηmax
D. ηmin<η<ηmax