單項選擇題

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

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單項選擇題

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

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

單項選擇題

The equator is（）.

A.the primary great circle of the Earth perpendicular to the axis
B.the line to which all celestial observations are reduced
C.the line from which a celestial body's altitude is measured
D.All of the above

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

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

The equator is（）.

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