【多选题】下列关于桥梁铰支座的说法,正确的是()。
C.
固定支座可以抽象为一个水平方向的约束反力和一个竖直方向上的约束反力
【单选题】下列关于活动(滚动)铰支座的说法正确的是()。
A.
构件可绕支座任意转动,但支座不可有与支撑面平行方向和垂直方向的任何移动
B.
构件可绕支座任意转动,可有与支撑面平行方向的移动,但垂直方向不可有任何移动
C.
支座处完全是固定的,既不能转动,也不可有水平和垂直方向的任何移动
D.
构件不可绕支座任意转动,可有与支撑面平行方向的移动,但垂直方向不可有任何移动
【单选题】宴请的时间和地点初步确定后,首先要征求( )的意见,在取得其同意后,再通知其他客人。
【简答题】I. Complete the sentences with these words. carefree indifferent infrequent doesn't no not careless infallible invisiable never no one nothing If something is (1...
【简答题】根据短文内容判断正误,正确的在括号里填A, 错误的在括号里填B。 Sometimes people say that they see strange flying objects (物体) high up in the sky. People call these strange objects “Unidentified Flying Objects (UFOs)”. Dennis Barde...
【单选题】Loud people are more likely to be noticed in a group than quiet ones. So, too, are extremely attractive or unattractive individuals. Which of the following statements best explains the reason behind t...
A.
Our perception of reality depends on our past experiences.
B.
Our perception of reality depends on our personality.
C.
The relationship of a target to its background influences our perception of the target.
D.
The time at which we see an object can influence our perception of the object.
E.
Our motives and expectations affect our perception of a target.
【简答题】People see an object and want to express it incommunication with others, so they have to give the object a name or ________.
【单选题】连杆在工作时,由于受到复杂的( )载荷作用,会发生连杆的弯曲和扭曲。
【简答题】磺化,磺化是向原料烷基苯分子上引入磺基, 三氧化硫磺化过程属于()反应,主要发生在液体表面或内部。
【简答题】阅读理解 Every object tells a story. Even the most ordinary objects can present to us powerful images. Sometimes it is the ordinary nature of these objects that actually makes them so extraordinary. Such ...