It is required that______should be used during the poor visibility if the radar’s screen shows heavy sea returns.
A. Gain Control
Brilliant Control
C. Anti-clutter Sea Control
D. Sweep Intercept
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It is predicted that heavy rains are ______ to flood the harbor and its vicinity in a few
A. frightening
B. threatening
C. scattering
D. Warning
吊笼中乘人或载物时,应该使荷载均匀分布,防止偏重,严禁超载运行。()