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單項選擇題

The radar control that shortens all echoes on the display and reduces clutter caused by rain or snow is the（）.

A.sensitivity time control (sea clutter control)
B.receiver gain control
C.brilliance control
D.fast time constant (differentiator)

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單項選擇題

The radar control that reduces weak echoes out to a limited distance from the ship is the（）.

A.sensitivity time control (sea-clutter control)
B.receiver gain control
C.brilliance control
D.fast time constant (differentiator)

單項選擇題

The officer of the watch should use radar when appropriate and at all times in（）waters.

A.congesting
B.congested
C.congestion
D.congest

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