题目内容

I went to Sue's house, but she wasn't there.

A. She went out
B. She has gone out
C. She had gone out
D. She had been going out.

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We were extremely tired at the end of the journey. ________ for more than 24 hours.

A. We have travelled
B. We have been travelling
C. We had travelled
D. We had been travelling

当平衡阀的阻力系数增大时，阀门的流量G（）

A. 增大
B. 减小
C. 不变
D. 以上都不对

平衡阀与普通阀门最主要的区别之一是（）

A. 检修时关闭平衡阀，关闭后不能复位
B. 传统阀门可显示流量值
C. 具有开度锁定装置
D. 平衡阀不能计算出开度值

供热系统的运行调节通常包括哪几种形式？

A. 分阶段改变流量的质调节
B. 间歇调节
C. 质调节
D. 量调节