单项选择题

On which of the following heated surfaces of a flash type evaporator would you be more likely to find soft scale formation?（）

A.Feed-water heater internal tube surfaces
B.Internal distillate cooler tubes
C.Flash chamber vertical surfaces
D.Distilling condenser tubes

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船舶辅助机械

On which of the following heated surfaces of a flash type evaporator would you be more likely to find soft scale formation?（）