The operating cord on an inflatable li

1、Which of the following can an operator

Which of the following can an operator use to shutdown a system into single-user mode?（）Ashutdown -dBshutdown -sCshutdown -mDshutdown -Fr -s 1

2、The magnetic compass operates on the p

The magnetic compass operates on the principle that（）.Alike magnetic poles attractBunlike magnetic poles repelCunlike poles attractDthe poles of the compass line up with the geographic poles of the earth

3、The inside light in an inflatable life

The inside light in an inflatable liferaft is turned on（）.Aautomatically as the liferaft inflatesBwith a switch near the boarding handleCat night because the light has a photosensitive switchDby screwing the bulb in after the raft is inflated

4、When the result of an operation become

When the result of an operation becomes larger than the limits of the representation,______ occurs.AoverdoseBoverflowCoverdraftDoverexposure

5、The water in an operating auxiliary bo

The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.AhourBdayCweekDmonth

6、When the GMDSS Radio Operator on watch

When the GMDSS Radio Operator on watch hears“SECURITE”spoken three times he can expect to receive a message concerning（）.AThe safety of navig...