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 （）.<br>A:There is apparent condensate in piping<br>B:The steam is not discovered after admitting steam<br>C:The condensate should be fully loaded in the piping as admitting steam<br>D:The condensate should be fully drained from the piping while admitting steam

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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