单项选择题
Your tanker is loaded down to her marks，and you find that she has too much trim by the stern. To adjust the trim，you may（）.
A.add ballast forward B.load more cargo forward C.shift bunkers forward D.All of the above
多项选择题 随着教育测验兴盛期的结束，在20世纪30年代开始，教育评价的概念被提了出来，其发展经历了（）。
单项选择题 During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）
判断题 主轴瓦间隙不均时，将发生过热，偏磨，烧瓦和抱轴等故障。
