单项选择题 夹紧力应作用在刚度较好的部位,以减少工件的夹紧变形 A、正确 B、错误
单项选择题 Vans are more polluting than cars because they spit out more nitrous oxides. A、正确 B、错误
单项选择题 Theodore Dreiser was once criticized for his ______ in style, but as a true artist his strength just lies in that his style is very serious and well calculated to achieve the thematic ends he sought. A. crudeness B. elegance C. conciseness D. subtlety
单项选择题 在上市公司杜邦财务分析体系中,最具有综合性的财务指标是( )。 A. 营业净利率 B. 净资产收益率 C. 总资产净利率 D. 总资产周转率
不定项选择 某系统的根轨迹有两个起点位于原点,则说明该系统开环传递函数包含两个积分环节。
判断题 国际规定大城市公交车拥有率为7~9辆/万人
单项选择题
单项选择题 有一平面简谐波沿轴的正方向传播,已知其周期为,振幅为,波长为,且在时坐标原点处的质点位于负的最大位移处,则该简谐波的波动方程为 ( ) A. B. C. D.
问答题 姑家女如不嫁舅家,其聘礼则“俱入母舅家”。此婚俗称为“____”。
问答题 (Fill in the blank)What is the meaning of the geometric factor, X1, 2 . [填空1]