單項(xiàng)選擇題()behalf of my owners,I hereby give you my formal notice.

A.At
B.On
C.Of
D.In


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2.單項(xiàng)選擇題The Local Notice to Mariners is usually published().

A.daily
B.weekly
C.monthly
D.semiannually

5.單項(xiàng)選擇題Mariners are FIRST warned of serious defects or important changes to aids to navigation by means of().

A.marine broadcast Notice to Mariners
B.Weekly Notices to Mariners
C.corrected editions of charts
D.Light Lists

6.單項(xiàng)選擇題Please report your position 4 hours()advance.

A.at
B.for
C.in
D.to

7.單項(xiàng)選擇題The Experimental Lighthouse-buoy has no navigational significance and may be removed at will.The above sentence means().

A.It's of no use for navigation and would be removed with notice
B.It's useful in navigation and may be removed without notice
C.It's helpless in navigation and may be removed without notice
D.It's helpful in navigation and may be removed without notice

10.單項(xiàng)選擇題On a clear,warm day,you notice the approach of a tall cumulus cloud. The cloud top has hard well defined edges and rain is falling from the dark lower edge. Should this cloud pass directly overhead().

A.it will be preceded by a sudden increase in wind speed
B.it will be preceded by a sudden decrease in wind speed
C.the wind speed will not change as it passes
D.the wind will back rapidly to left in a counterclockwise direction as it passes