单项选择题 When the PSCO would like to witness a fire drill carried out by the crew, he should consult （）to locate a simulated fire.

单项选择题 The PSCO would be justified in making a detailed inspection of all life-saving appliances, if he sees that （）.

单项选择题 During inspection of oil and oily mixtures from machinery spaces, which of the following factors should be taken into account by the PSCO? （）