單項(xiàng)選擇題

（）the canal transit，the radar was operating.

A.At
B.In
C.During
D.With

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單項(xiàng)選擇題

（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.

A.Gain Control
B.Brilliant Control
C.Anti-clutter Sea Control
D.Sweep Intercept

單項(xiàng)選擇題

（）is on the panel of radar.

A.KEYLOCK
B.REPEATER
C.STATIC INVERTER
D.ANTI-CLUTTER-SEA