【单选题】下列哪类集装箱在装卸时一般使用喷管和吸管操作( )。
【判断题】纯弯曲梁横截面上,任意点的正应力与该点到中性轴的距离成正比。
【简答题】A.They are scientific. B.They are sarcastic. C.They are unbelievable. D.They are reasonable.
【简答题】纯弯曲梁横截面上只有____应力。中性轴上各点的正应力为____,离中性轴最远的点的正应力最大,即正应力与该点到中性轴的距离成____。
【简答题】在梁的平面弯曲中,横截面上的正应力σ与该点到中性轴的距离成比,中性轴上各点处的正应力等于()。
【单选题】1385下列哪类集装箱在装卸时一般使用喷管和吸管操作( ).
【简答题】A.They are walking. B.They are drinking. C.They are watching TV. D.They are studying.
【简答题】A.They are shopping. B.They are jogging. C.They are seeing a movie. D.They are drinking coffee.
【简答题】A.They are unreasonable. B.They are varied. C.They are untraceable. D.They are identical.