A virtual rise in the center of gravitty may be caused by（）. ["filling a partially tank","using an on board crane to life a freely swinging heavy object","emptying a partially filled tank","transferring ballast from the forepeak to the after peak"]
培训需求分析的作用表现在哪些方面？
下列哪项不属于传统的公共管理方法（）。 ["法律方法","行政方法","经济方法","说教方法"]
液压油的性质有（） ["粘性","密度","可压缩性","抗燃性"]
都市紧凑型SUV昂科拉1.4L双可变气门正时涡轮增压发动机性能卓越，表现优异，三款车型（两驱手动/两驱自动/四驱自动）百公里油耗不正确的（）。 ["6.3L","6.9L","7.6L","8.0L"]
何为渔湾的“龙床”？
