单选题mast light（）A 桅灯B 右舷灯C 尾灯D 探照灯

An anchored vessel on pilotage duty must show which light(s) at night?

A.A sternlight only

B.Anchor lights only

C.A white light over a red light only

D.A white light over a red light and anchor lights

The bottom of the mast rests on a part of the keel called the mast ______.

A.foot

B.heel

C.step

D.sole

在油船上，------因素影响油气排放。

A.风向和风力；卸货速度；P/V阀或惰气桅(MAST RISER)的高度和位置

B.风向和风力；装货速度；P/V阀或惰气桅(MAST RISER)的高度和位置

C.风向和风力；装货速度；P/V阀或惰气桅(MAST RISER)的数量和状态

Which fitting is used to connect the boom to the mast?

A.Clevis pin

B.Gunter-lug

C.Gooseneck

D.Transom

______ day，pilot flag should be displayed from main mast．

A.From

B.By

C.on

D.With

Sideways movement of the mast is resisted by the ______.

A.shrouds

B.halyards

C.sheets

D.forestay

A light used to signal passing intentions must be an ______.

A.all-round yellow light only

B.all-round white light only

C.all-round blue light only

D.alternating red and yellow light

A vessel trawling will display a ______.

A.red light over a white light

B.green light over a white light

C.yellow light over a red light

D.white light over a green light