单项选择题

From which type of cloud can a tornado or waterspout develop?（）

A.Nimbostratus
B.Altostratus
C.Cumulonimbus
D.Cirrus

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单项选择题

Freeboard is measured from the upper edge of the（）.

A.bulwark
B.deck line
C.gunwale bar
D.sheer strake

单项选择题

Frapping lines（）.

A.secure the lifeboat in the davits when in the stowed position
B.bring the lifeboat close alongside 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

单项选择题

Forty-five fathoms is marked on the anchor chain by（）.

A.one turn of wire on the first stud from each side of the detachable link
B.two turns of wire on the second stud from each side of the detachable link
C.three turns of wire on the third stud from each side of the detachable link
D.four turns of wire on the fourth stud from each side of the detachable link