硬度是测量指甲板容易被（）程度的标准。

A.强度

B.刮伤

C.坚韧度

D.刻伤

What is a spill pipe?（）

A.A drainage pipe that carries rain or spray from an upper deck to a lower deck

B.A pipe under the anchor windlass leading to the chain locker

C.A chute，usually over the stern，to lead dumped garbage clear of the hull

D.An opening in the deck leading outside the hull