计算电泵的泵效等于泵的有用功与()的功率比值。
A、泵筒
B、电泵
C、泵轴
D、活塞
参考答案:C
溴化锂机组运行期间的结晶消除方法不正确的是()。
A、将机组转入受动控制后,重新启动,微开加热源阀们。
B、增加冷却水,使稀溶液温度升高,一般控制在60℃左右,但不要超过70℃。
C、可将冷剂水旁通阀慢慢打开,使部分冷剂水通到吸收器。
D、如果结晶严重,一时难以解决,可同时用蒸汽或热水直接对结晶部分全面加热。
Maybe if I _____ science, and not literature then, I would be able to give you more help. [ ]
A. studied
B. would study
C. had studied
D. was studying