【多选题】在边际贡献大于固定成本的情况下,下列措施中有利于降低企业复合风险的有( )。
【单选题】Work with a partner. What can you infer from each statement from the reading passage? Choose the best inference. More than 10,000 volunteers or "citizen scientists" around the world joined the search ...
A.
a. A lot of people don't know much about Genghis Khan.
B.
b. A lot of people are interested in finding Genghis Khan's tomb.
【简答题】The news came as a great surprise to everybody, because the governor
【单选题】下列关于压杆的说法中错误的有()。
A.
对细长压杆,选用弹性模量E值较大的材料可以提高压杆的稳定性
B.
用优质钢材代替普通钢材,对细长压杆稳定性并无多大区别
C.
用优质钢材代替普通钢材,对各类压杆稳定性并无多大区别
【判断题】下列关于稳定的说法哪种正确( )A、压杆失稳是因为杆中部的应力超过了钢材的强度B、压杆失稳是压力使刚度减小并消失的过程C、压杆失稳是因为杆件有缺陷D、压杆失稳时屈曲的形式是弯曲A. 错误B. 正确C. 错误D. 错误
【单选题】下列关于压杆理解的说法中错误的有()。
A.
压杆从稳定平衡过渡到不稳定平衡时轴向压力的临界值,称为临界力或临界荷载
B.
压杆处于临界平衡状态时横截面上的平均应力称为临界应力
C.
分析压杆稳定性问题的关键是求杆的临界力或临界应力
【多选题】Work with a partner. Imagine you work for a tour company. You are going to present a tour to a group of tourists. Decide on the best order to present these topics.
C.
the flight information
E.
the schedule of places to visit
F.
the volunteer activities
【单选题】涂膜防水屋面主要包括找平层、涂膜防水层、细部构造及()四个分项工程。