单项选择题
To avoid impingement attack, care must be taken with the water （） through the tubes of the heat exchangers.
A.temperature
B.velocity
C.density
D.viscosity
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相关考题
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单项选择题
A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.
A.the low inertia
B.the high inertia
C.the low velocity
D.the high velocity -
单项选择题
A （） in the air delivery line near to each compressor is essential.
A.butterfly valve
B.globe valve
C.gate valve
D.non-return valve -
单项选择题
Adequate attention must be given to the water cooling system of the air compressors, for （） can cause condensation on the cylinder walls.
A.overcooling
B.poor cooling
C.overloading
D.unloading
