单项选择题
One distinct advantage of flash type evaporators, as compared to most other evaporators, is that in a flash evaporator （）.
A.high temperature distillate can be re- circulated to induce additional flashing
B.scale formation is not a severe problem
C.cold shocking is more effective in removing scale
D.water purity is greatly increased at high capacity
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A.high pressure liquid line
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Compared to a constant pitch propeller, a controllable pitch propeller（）.
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单项选择题
Compared to a constant pitch propeller, a controllable pitch propeller（）.
A.more efficiently uses available engine power
B.operates at a lower efficiency at a fixed speed
C.produces the same torque at lower engine power
D.develops its rated power at a lower speed
