某吸收过程,已知其气相传质分系数ky=4´10-4kmol/(m2×s),液相传质分系数kx=8´10-4kmol/(m2×s) 由此可判断该过程为__________。
A. 液膜控制;
B. 气膜控制;
C. 判断依据不足;
D. 气膜阻力和液膜阻力相差不大
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在北方地区的冬天,将室外的冷空气引入室内进行设备降温,以下说法正确是( )。
A. 由于空气很冷,散热较果好
B. 由于不使用压缩机,可以省大量的电费
C. 空气温度太低对设备影响较大
D. 降温过程中空气相对湿度极低,容易产生静电,对设备影响较大
You should have put the milk in the ice box; I expect it ________ undrinkable by now.
A became
B had become
C has become
D becomes
Codes are a way of writing something in secret; ________, anyone who doesn’t know the code will not be able to read it.
A that is
B worse still
C in short
D on the other hand
His long service with the company was ________ with a present.
A admitted
B acknowledged
C attributed
D accepted