A shroud is（）.

A.any wire running fore-and-aft on a ship

B.any wire with a fiber core

C.a heavy wire extending from the trunk of the mast to the head of the boom

D.a heavy wire extending from the mast，atwartships to the deck，to support the mast

培训教材开发信息搜集工作的基本原则不包括：（）

A.经济实用原则

B.系统性原则

C.准确性原则

D.实事求是原则