The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by （）.<br>A:a separate air ejector unit<br>B:a direct unimpeded connection between second stage and salt water feed heater<br>C:either by vacuum drag or an external line from the first stage via a fixed orifice<br>D:the fixed orifice provided in the steam supply line

The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by （）.
A:a separate air ejector unit
B:a direct unimpeded connection between second stage and salt water feed heater
C:either by vacuum drag or an external line from the first stage via a fixed orifice
D:the fixed orifice provided in the steam supply line

出自：海船船员证

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