The radar control that shortens all echoes on the display and reduces clutter caused by rain or snow is the（）.<br>A:sensitivity time control (sea clutter control)<br>B:receiver gain control<br>C:brilliance control<br>D:fast time constant (differentiator)

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)

出自：海船船员证

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