A shallow dish positioned at the normal water level is connected to the（）This enables the blowing down or removal of scum and impurities from the water surface.<br>A:main stern stop valve<br>B:auxiliary steam stop valve<br>C:scum valve<br>D:blow down valve

A shallow dish positioned at the normal water level is connected to the（）This enables the blowing down or removal of scum and impurities from the water surface.
A:main stern stop valve
B:auxiliary steam stop valve
C:scum valve
D:blow down valve

出自：海船船员证

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