單項(xiàng)選擇題

Towlines should be inspected for chafing where the towline（）.

A.passes over the stern of the towing vessel
B.passes through chocks
C.is attached to the disabled vessel
D.All of the above

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The strongest of the natural fibers is（）.

A.cotton
B.hemp
C.manila
D.sisal

單項(xiàng)選擇題

The spray of water in low-velocity fog will have（）.

A.greater range than high-velocity fog
B.lesser range than high-velocity fog
C.about the same range as high-velocity fog
D.greater range than a solid stream