A、main stern stop valve
B、auxiliary steam stop valve
C、scum valve
D、blow down valve
更多“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.”相关的问题
A、We haven‘t booked the dishes. B、We haven‘t ordered the dishes. C、Yeah. I‘m saving these seats for friends. D、Yeah. I‘m stuffed.
A、the position is suitable B、the position is reliable C、the position is changeable D、the position is fixable
A、A.dead-reckoning position B、B.fix B.estimated position C、C.probable position D、D.running fix
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