试题与答案

在河流水质取样时,每根取样垂线上应按( )布设水质取样点。A.流速 B.水深 C.

题型:单项选择题

题目:

在河流水质取样时,每根取样垂线上应按( )布设水质取样点。

A.流速

B.水深

C.取样断面形

D.河道弯曲情况

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析: 35=62-1;63=82-1;80=92-1;99=102-1;143=122-1。6,8,9,10,12正好是一个合数列,因此空格处应为42-1=15。

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