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【单选题】
工字形截面在上翼缘受集中荷载作用,钢材为Q235,为提高其整体稳定承载力,最合理的方法是( )。A.
加高腹板
B.
在梁跨中上翼缘加侧向支撑
C.
改用Q345钢材
D.
在梁跨中下翼缘加侧向支撑
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【简答题】听下面一段对话，回答第1-3小题。 1. What is the probable relationship between the speakers? A. Friends B. Classmates C. Co-workers 2. What does the man like to do? A. To cycle. B. To garden. C. To climb mountains. 3...
【多选题】Which of the following statement about systematic sampling is/are true?
A.
Sample members are selected from the sampling frame according to a random starting point and a fixed, periodic interval.
B.
The interval, called the sampling interval Kth, is calculated by dividing the population size N, by the desired sample size n. Kth=N/n
C.
The starting point can be obtained in a lottery method.
D.
The starting point can be obtained by using a random number table.
E.
It is a method belonging to non-probability sampling.
【简答题】90°偏刀主要用来车削（）的工件。
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