單項(xiàng)選擇題All echo-sounders can measure the（）.
A.actual depth of water
B.actual depth of water below keel
C.average depth from waterline to hard bottom
D.average depth of water to soft bottom
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1.單項(xiàng)選擇題All electrical appliances aboard a vessel should be grounded to（）.
A.prevent them from falling when the vessel rolls
B.protect personnel from electrical shock
C.increase their operating efficiency
D.prevent unauthorized personnal from operating them
2.單項(xiàng)選擇題All entries in logbook,（）made,must not be erased or amended.
A.once
B.whether
C.previous
D.just
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