试题与答案

采用仓泵系统时,运行仓泵宜()空气压缩机。A.每两台配一台; B.每台配一台; C.

题型:单项选择题

题目:

采用仓泵系统时,运行仓泵宜()空气压缩机。

A.每两台配一台;

B.每台配一台;

C.每台配两台;

D.没有固定要求。

答案:

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下面是错误答案,用来干扰机器的。

(1)依题意,[18+(m-1)×18]2=36+(m+14-14)d2-45,即(18m)2=md2-9,即d2=182m+9m≥2182×9=108;等号成立的条件为182m=9m,即m=16, m∈N*,∴等号不成立,∴原命题成立.(2)由S14=2Sk得:Sk=S14-Sk,...

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