3 A business sublets part of its office accommodation.The rent is received quarterly in ad

A light siglinal consisting of three flashes means ______.

A.I an in doubt as to your actions

B.My engines are full speed astern

C.I desire to overtake you

D.I am operating astern propulsion

How do you know that the oil pressure is a bit low？

A．The warning light flashes only when the car runs at fast speed.

B．The warning light flashes only when the car is slowing down.

C．The warning light flashes continuously.

D．The warning light flashes when the engine idles.

A.a light signal of at least five short and rapid flashes

B.one prolonged，one short，one prolonged，and one short whistle blasts

C.four short whistle blasts

D.two short whistle blasts

Which is NOT a distress signal ().

A.A continuous sounding with any fog signal apparatus

B.A signal sent by radiotelephone consisting of the spoken word Mayday

C.An International Code Signal of N.

D.The firing of green star rockets or shells

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.alternating red and yellow light

B.alternating white and yellow light

C.all-round white or yellow light

D.all-round white light only