单项选择题
The International Association of Lighthouse authorities (IALA) buoyage system “A” uses some types of marks to distinguish safe navigation? Which type(s) does(do) not belong to the system?（）
A.lateral marks and cardinal marks B.safe water marks C.isolated danger marks and special marks D.dangerous water marks
单项选择题 Which refers to the living space for seafarers?（）
单项选择题 （）cargoes in IMSBC code are those that are likely to liquefy.
单项选择题 （）should develop, implement and maintain a safety mangement system which includes procedures for internal audits and mangement reviews.
