第18题: [单项选择]On a semisubmersible ship,reserve buoyancy is increased by the presence of void spaces above the waterline in the(). A. submerged hulls B. quarters C. columns and upper structure D. submerged connecting structures 参考答案:C
第30题: [单项选择]The agency, ______ to set and enforce health standard for American workers, has been promising a cotton dust standard for several years. A. which is B. which it is C. whose job it is D. of whose job is 参考答案:C 答案解析:应选非限定性定语从句whose job it is…,相当于it is the agency's job to set and enforce…