单项选择题
A.completed B.carried out C.cleaned D.steamed
A donkey boiler is （）.A.one to supply steam to the main...
单项选择题A donkey boiler is （）.
A.one to supply steam to the main propulsion turbine B.an auxiliary boiler C.A and B D.neither A nor B
Safety valves on a boiler vent to the （）.A.fuel tankB.b...
单项选择题Safety valves on a boiler vent to the （）.
A.fuel tank B.bilge C.atmosphere D.auxiliary exhaust line
The boiler feed pump discharge pressure is higher than ...
单项选择题The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.
A.ensure feed water flow into the boiler B.keep the steam drum pressure high C.prevent water hammer in the feed line D.help the feed water flash to steam
