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电压寿命特性

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气压机第一临转为（）r/min。

汽车用发动机分（）和柴油发动机

A. 汽油发动机
B. 蒸汽式发动机
C. 混合发动机
D. 电动发动机

说明土地价格变动的趋势及规律性。

While on watch at sea you must maintain a proper lookout at all times. You are on a 200-foot cargo vessel with an unobstructed view astern from the steering position. The vessel is being hand-steered during daylight hours in good visibility and clear of any navigational hazards. The lookout may be（）.

A. the helmsman
B. the officer on watch
C. either A or B
D. neither A nor B