A light used to signal passing intentions must be an（）.

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

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

A、must have been

B、would be

C、must be

D、will be

Which of the following statements is TRUE regarding automatic identification systems（AIS）________．

A.AIS cannot be used to make passing arrangements because the system is not capable of this type of ship-to-ship communications

B.AIS cannot be used to make passing arrangements because the ship-to-ship text messaging feature is for emergency use only

C.AIS can be used to make passing arrangements via ship-to-ship text messaging but a vessel operator is not relieved from the requirement to sound whistle signals or make arrangements via bridge-to-bridge radiotelephone

D.AIS can be used to make passing arrangements via ship-to-ship text massaging thus relieving a vessel operator from making such arrangements via bridge-to-bridge radiotelephone or signaling intent to pass via whistle signals

A list signal of one white light indicates that the vessel is ______.

A.on an even keel

B.listing about 1° to the side the light is displayed on

C.listing over 5°With the light displayed on the high side

D.listing，and the chutes should be directed to the side where the light is displayed

A vessel may use any sound or light signals to attract the attention of another vessel as long as ______.

A.white lights are not used

B.red and green lights are not used

C.the signal cannot be mistaken for a signal authorized by the Rules

D.the vessel signals such intentions over the radiotelephone

In a narrow channel or fairway when overtaking can take place only if the vessel to be over-taken has to take action to permit safe passing， the vessel intending to overtake shall indicate her intention by sounding appropriate signal． This means that ________ ．

A.the vessel to be overtaken shall sound appropriate signal first

B.the overtaking vessel shall sound appropriate signal first

C.the overtaking vessel shall take action to permit safe passing

D.the vessel to be overtaken shall take action to permit safe passing before hearing appropriate signal