An independent bilge suction is required for （）. ["ballast tanks","sludge tanks","machinery space bilges","cargo hold bilge"]
以下哪一项不属于确立企业文化的基本内容（） ["制定统一的规章制度","塑造共有的价值观体系","培养良好的工作作风","树立优秀的企业形象"]
根据业务受理查询情况，允许修改或删除的业务状态是（）。 ["办理中","提交","已办理","拒绝"]
小于（）个大气压（即1.01×105Pa）的压力称为负压。 ["1","3","4","2"]
Although the main business of the shipowners may be that of brewers，in their capacity as shipowners they must（）by the standard of conduct of the ordinary reasonable Shipowner in the management and control of vessels. ["judge","be judging","be judged","have judged"]
试比较PS1和PS2的结构及功能特点。
