单项选择题

How can a SART’s effective range be maximized? （）

A.The SART should be placed in water immediately upon activation
B.The SART should be held as high as possible
C.Switch the SART into the "high" power position
D.If possible，the SART should be mounted horizontally so that its signal matches that of the searching radar signal

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单项选择题

A yellow signal floating in the air from a small parachute，about 300 feet above the water，would indicate that a submarine（）.

A.has fired a torpedo during a drill
B.is about to rise to periscope depth
C.is on the bottom in distress
D.is disabled and unable to surface

单项选择题

Which statement is TRUE concerning the danger signal?（）.

A.When any vessel fails to understand the intentions of an approaching vessel she must sound the danger signal
B.Only the stand-on vessel can sound the danger signal
C.Distress signals may be used in place of the danger signal
D.The danger signal consists of 4 or more short blasts of the whistle

单项选择题

In the safety communication，you can get your R/O（）it for you.

A.do
B.to do
C.doing
D.done