單項(xiàng)選擇題

The recording fathometer produces a graphic record of the（）.

A.bottom contour only up to depths of 100 fathoms
B.depth underneath the keel against a time base
C.contour of the bottom against a distance base
D.depth of water against a distance base

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單項(xiàng)選擇題

The points on the earth’s surface where the magnetic dip is 90° are（）.

A.Along the magnetic equator
B.Connected by the isoclinal line
C.The isopors
D.The magnetic poles

單項(xiàng)選擇題

The four standard light colors used for lighted aids to navigation are red，green，white，and （）.

A.purple
B.orange
C.blue
D.yellow

The recording fathometer produces a graphic record of the（）.

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The points on the earth’s surface where the magnetic dip is 90° are（）.

The four standard light colors used for lighted aids to navigation are red，green，white，and （）.

The four standard light colors used for lighted aids to navigation are red，green，white，and （）.