单选题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.Amain stern stop valveBauxiliary steam stop valveCscum valveDblow down valve
单选题
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
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