单选题Vessels，（）support vessels，should not enter the safety zone of a deepwater port unless clearance has been obtained from the Vessel Traffic Supervisor.A besidesB exceptedC otherwiseD other than

Vessels should be manned ________duly qualified offcers and crew adequate________ensure the safety of navigation.

A.by/to

B.with/to

C.with/for

D.from/for

The following conditions，except ______，require that vessels be towed through the entire Canal．

A.vessels without mechanical motive power

B.vessels with disabled machinery or bad steering

C.vessels with dangerous cargoes on board

D.vessels liable to become unmanageable for any other reason

On which vessels is GMDSS required?______.

A.All vessels capable of international voyages

B.Vessels operating outside of the range of VHF coastal radio stations

C.SOLAS Convention ships of 300 gross tonnage or more

D.Coastal vessels of less than 300 gross tons

In which situation do the Rules require both vessels to change course ?______.

A.Two power-driven vessels meeting head-on

B.Two power-driven vessels crossing when it is apparent to the stand-on vessel that the give-way vessel is not taking appropriate action

C.Two sailing vessels crossing with the wind on the same side

D.All of the above

As these features are not all charted，special caution should be exercised ______ vessels navigating in the vicinity．

A.by

B.with

C.on

D.in

Automatic identification systems（AIS）are required to ______．

A.provide safety-related information automatically to shore stations，other vessels and aircraft

B.receive safety-related information automatically from similarly equipped vessels

C.exchange safety-related information with shore-based facilities

D.All of the above

Radar reflectors are required for ______.

A.all fishing vessels over 39 feet in length

B.sail-propelled fishing vessels

C.all fishing vessels of less than 200 GT

D.wooden hull fishing vessels with a poor radar echo