题目内容

离心泵的流量调节阀安装在离心泵吸入管路上。

A. 对
B. 错

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若被输送的流体粘度增高，则离心泵的压头减小，流量减小，效率降低，轴功率增大。

A. 对
B. 错

Whose horse wins the race?

A. Namjin's
B. Mukhdalai's
C. neitherNamjin's norMukhdalai's

There are horses in the race this year.

A. 20
B. 80

The race is kilometers long.

A. 25
B. 50