A clearly visible beneath of RT-flex engines is their operation at all ship speedsThis is achieved by the superior combustion performance（）

A、A.shockless

B、B.smokeless

C、C.no vibration

D、D.noiseless

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第1题

[单选题] The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen（）.

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第2题

[单选题] 能够将文本框隐藏起来的属性是（）。

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第3题

[单选题] While on watch at sea you must maintain a proper lookout at all times. On a 700-foot cargo vessel being hand-steered during daylight hours in good visibility and clear of any navigational hazards，the lookout may be（）.

A、the helmsman B、the mate on watch C、Either A or B D、Neither A nor B

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第4题

[单选题] 他们应该明白不同报警信号的意义。（）

A、They should be clear about all fire-fighting equipment.. B、They should be understood about the meaning of the different alarm signals. C、They should be clear about all life-saving equipment. D、They should be clear about the meaning of the different alarm signals.

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第5题

[单选题] In NAVTEX service, VITAL warnings will（）by transmitting station.

A、be transmitted at once though the frequency is not clear B、be transmitted as soon as the frequency is cleared coordinately C、be transmitted at its scheduled transmissions D、be transmitted at next scheduled transmissions