单项选择题
The second stage feed-water temperature and shell absolute pressure in a multistage, flash type, distilling plant is （）
A.higher than the first stage feed-water temperature and absolute shell pressure
B.lower than the first stage feed-water temperature and absolute shell pressure
C.the same as the first stage feed-water temperature and absolute shell pressure
D.not related to the feed-water temperature and absolute shell pressure
相关考题
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单项选择题
The efficiency of a flash type evaporator can be increased by（）
A.lowering brine discharge density
B.decreasing the absolute pressure of each stage
C.increasing the saltwater feed heater temperature
D.increasing the pressure at the spray pipe -
单项选择题
In some modern large diesel engines, which of the following is used as the support for the main bearings?（）
A.Bedplate
B.Block
C.Base
D.Sump -
单项选择题
Valve lash, or clearance refers to the （）
A.clearance between the top of the valve stem and the rocker arm
B.compression of the valve springs
C.clearance between the valve seat inserts and the head
D.out of roundness of the fuel injection cams
