主要用于病因性预防疟疾的药物是

A．氯喹

B．乙胺嘧啶

C．青蒿素

D．伯氨喹

E．磺胺嘧啶

Prior to taking over the deck watch in port,the relieving officer shall not be informed by the officer in charge of the deck watch as to（）.

A.the depth of the water at the berth

B.the ship‟s draught

C.the duty of the relieving officer

D.the arrangement of anchor and the scope of the anchor chain