单项选择题
You should frequently compare drum-mounted and remote-reading water level indicators（） between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.
A.descriptions
B.discrepancies
C.different
D.deflections
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相关考题
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单项选择题
The safety valves should be tested and adjusted when the boiler survey is （）
A.completed
B.carried out
C.cleaned
D.steamed -
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 -
单项选择题
Safety valves on a boiler vent to the （）.
A.fuel tank
B.bilge
C.atmosphere
D.auxiliary exhaust line
