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

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)

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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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