试题与答案

直达特快旅客列车的车次范围是()次。A.Z1~Z298 B.Z1~Z998 C.Z1

题型:单项选择题

题目:

直达特快旅客列车的车次范围是()次。

A.Z1~Z298

B.Z1~Z998

C.Z1~Z498

D.Z1~Z598

答案:

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参考答案:给水采用中性水处理工况对给水质要求很严:电导率<0.15us/cm,如水质不纯会破坏保护膜。PH值:为了保证水质呈中性,其PH值应控制在6.5-7.5范围内。给水溶解氧浓度一般在50~300ug/l范围内。以保证源源不...

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