单项选择题 The officer responsible for the sanitary condition of the engineering department is the （）.

单项选择题 The max effluent of the oil content from a ship of 400 tons gross tonnage and above other than an oil tanker is（）.

单项选择题 Sufficient cargo tanks shall be（）prior to each ballast voyage in order that，taking into account the tanker’s trading pattern and expected weather conditions，ballast water is put only into cargo tanks which have been crude oil washed.