单项选择题
A.like magnetic poles attract B.unlike magnetic poles repel C.unlike poles attract D.the poles of the compass line up with the geographic poles of the earth
The magnetic compass magnets are acted on by the horizo...
单项选择题The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the（）.
A.north magnetic pole B.south magnetic pole C.magnetic prime vertical meridian D.magnetic equator
The lubber’s line on a magnetic compass indicates（）.A.c...
单项选择题The lubber’s line on a magnetic compass indicates（）.
A.compass north B.the direction of the vessel's head C.magnetic north D.a relative bearing taken with an azimuth circle
The lubber’s line of a magnetic compass（）.A.always show...
单项选择题The lubber’s line of a magnetic compass（）.
A.always shows true north direction B.indicates the vessel's heading C.is always parallel to the vessel's transom D.is located on the compass card
