A、Smoke signal
B、Flash signal
C、Fire signal
D、Radio emergency transmission
更多“（）is the most visible signal of distress from a lifeboat at sea in the daytime.”相关的问题
A、is most accurate before sunrise B、is most accurate after sunset C、should only be observed when the Sun's lower limb is above the horizon D、is most accurate when the Sun's center is observed on the visible horizon
A、The drum is faulty. B、The print buffer is full. C、The printer is out of toner. D、The fuser is faulty.
A、A. The ORA_ARCHIVE_STATE column visibility is controlled by the ROW ARCHIVAL VISIBILITY session parameter. B、B. The ORA_ARCHIVE_STATE column is updated manually or by a program that could reference activity tracking columns, to indicate that a row is no longer considered active. C、C. The ROW ARCHIVAL VISIBILITY session parameter defaults to active rows only. D、D. The ORA_ARCHIVE_STATE column is visible if referenced in the select list of a query. E、E. The ORA_ARCHIVE_STATE column is updated automatically by the Oracle Server based on activity tracking columns, to Indicate that a row is no longer considered active.
A、existing visibility conditions，limited only by the curvature of the Earth B、perfect visibility conditions，limited only by the curvature of the Earth C、existing visibility conditions，limited only by the intensity of the light D、perfect visibility conditions，limited only by interference from background lighting
A、situations when you can see vessels on radar that you cannot see visually B、visibility of less than half a mile C、any condition where visibility is restricted D、visibility where you cannot see shore
A、Situations when you can see vessels on radar that you cannot see visually B、Visibility of less than half a mile C、Any condition where visibility is restricted D、Visibility where you cannot see shore
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