PORT A BIT SLUGGISH means that port rudder（）.

单项选择题Free communication effect is in direct proportion to（）.

A.length and width of space
B.length of space only
C.width of space only
D.neither length nor width

单项选择题Electrical wiring on all T-Boats must be（）.

A.concealed to prevent mechanical damage
B.concealed so the boat can be maintained more easily
C.protected from the weather
D.in an accessible place behind the ceiling

单项选择题DO NOT，REPEAT，NOT OVER-TAKE means that you should（）.

A.overtake
B.not overtake
C.overtake or not
D.decide if you should overtake

单项选择题By regulation，you MUST keep a record of the use of your radiotelephone for at least（）.

A.one month
B.four months
C.six months
D.one year

单项选择题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