吊钩、吊环一般都采用20号优质碳素钢或16Mn钢制作，因为这两种材料的（）较好。
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“抗日烈士纪念塔”这7个遒劲有力的大字是哪位书法家用什么书写的？
The linear motion of a diesel engine piston is converted to the rotary motion required to drive gears, propeller shafts, and generators by the （）.
A. flywheel
B. crankshaft
C. journal bearings
D. camshaft
Reserve buoyancy is（）.
A. also called GM
B. the void portion of the ship below the waterline which is enclosed and watertight
C. affected by the number of transverse watertight bulkheads
D. the watertight portion of a vessel above the waterline
调查单位与报告单位总是相同的。
A. 正确
B. 错误
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