When the tail-shaft is drawn from a vessel in dry-dock, which of the following inspections
A. The propeller hub taper and shaft keyway should be inspected for cracks or corrosion
B. The stern bearing alignment with the stern frame should be checked
C. The interior of the stern tube should be inspected for leaks
D. The shaft liner should be removed and inspected for cracks
筒状活塞冷却侧裂纹部位除在顶面冷却侧外，还有_______处
A. 环槽平面
B. 裙部冷却侧
C. 下端面
D. 销座
According to the passage, which of the following statement is not true？
A. the heat exchanging surfaces should be kept substantially clean
B. the heat exchanger flow passages should be clear of obstruction
C. seals for the plate heat exchanger needs to be renewed often
D. the cleaning process of the plate heat exchanger should be done following our experiences only
The depth of the ship below the waterline measured vertically to the lowest part of the hull is called
A. trim
B. lean
C. draft
D. tonnage
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