试题与答案

一般情况下,粗、中效过滤器的联合使用不能满足( )的净化要求。 A.使用中效空气净

题型:单项选择题

题目:

一般情况下,粗、中效过滤器的联合使用不能满足( )的净化要求。

A.使用中效空气净化系统的洁净室
B.一般空调房间
C.要求较高的空调房间
D.使用高效空气净化系统的洁净室

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析:[分析]: 由题设知,密度函数[*].没重心坐标为(X,Y),由对称性知[*] [*]

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