脊线（Ridge lines）

（）is used to communicate with another computer over telephone lines.

A:Keyboard B:Modem C:Mouse D:Printer

In the constant-tension mooring, the mooring lines holding the ship to the pier will maintain a constant tension even with changes in tide or ship ’s draft, ______.

A:without the necessity of manually adjusting the lines B:without the necessity of automatically adjusting the lines C:with the necessity of manually adjusting the lines D:with the un-necessity of automatically adjusting the lines

Before charging a refrigeration unit, the refrigerant charging lines should be .

A:flushed with clean refrigerant oil B:purged with the refrigerant C:washed with an ammonia and alcohol solution D:grounded to compressor

"The manila lines are made from the fibers of ______．

A:sisal B:jute C:agave D:abaca"

Frapping Lines are fitted to lifeboat davits to ______．

A:secure the lifeboat in the davits when in the stowed position B:bring the lifeboat close along the rail in the embarkation position C:give the occupants a safety line when the boat is being lowered from the embarkation level D:reduce the swinging of the lifeboat at the embarkation level"

Lines on a chart which connect points of equal magnetic variation are called ______．

A:magnetic latitudes B:magnetic declinations C:dip D:isogonic lines"

The lines led forward from the bow and aft from the stern when a vessel is moored to the dock are ______．

A:bow and stern lines B:breast lines C:halyards D:Warps"