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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Compared to a constant pitch propeller, a controllable pitch propeller（）.

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