The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.<br>A:ensure feed water flow into the boiler<br>B:keep the steam drum pressure high<br>C:prevent water hammer in the feed line<br>D:help the feed water flash to steam

The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.
A:ensure feed water flow into the boiler
B:keep the steam drum pressure high
C:prevent water hammer in the feed line
D:help the feed water flash to steam

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