单选题It should be apparent that little or nothing is gained by opening a drain at the same time as or after admitting steamThe above sentence probably means （）.AThere is apparent condensate in pipingBThe steam is not discovered after admitting steamCThe condensate should be fully loaded in the piping as admitting steamDThe condensate should be fully drained from the piping while admitting steam
单选题
It should be apparent that little or nothing is gained by opening a drain at the same time as or after admitting steamThe above sentence probably means （）.
A
There is apparent condensate in piping
B
The steam is not discovered after admitting steam
C
The condensate should be fully loaded in the piping as admitting steam
D
The condensate should be fully drained from the piping while admitting steam
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