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【判断题】
单元体的主平面上正应力出现极值,切应力为零;最大切应力对应的斜截面上切应力出现极值,正应力等于零。
A.
正确
B.
错误
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【简答题】We all have weaknesses and strengths—no matter who we are .Some get sick easily. Some are 36 people in communication, struggling with 37 . Sometimes weaknesses seem to outweigh (胜过)the strengths and s...
【单选题】We all make plans for the future all the time. Some of them are big plans, which affect our future lives. Some are small, unimportant plans, such as how we're going to spend the evening. Making plans ...
A.
Plans can be big or small based on their structures.
B.
A plan is a natural method of achieving something one imagines.
C.
A plan is an arrangement for actions in advance.
D.
Plans we are making today can hardly be realized.
【单选题】等截面直梁在弯曲变形时,挠曲线的曲率最大发生在( )
A.
挠度最大
B.
转角最大
C.
剪力最大
D.
弯矩最大
【判断题】梁的抗弯刚度 越大,则曲率越大,梁越不容易变形。
A.
正确
B.
错误
【简答题】晋商是指()省的商人。
【单选题】等截面直梁在弯曲变形时,挠曲线的曲率最大发生在 处。
A.
挠度最大
B.
转角最大
C.
剪力最大
D.
弯矩最大
【判断题】梁弯曲时,如果梁的抗弯刚度愈大,则梁的曲率越大,说明梁愈不容易变形。
A.
正确
B.
错误
【简答题】梁弯曲时,如果梁的抗弯刚度愈大,则梁的曲率越 ,梁越不容易变形.
【简答题】明清时期成为中国三大商帮之一的“晋商”指的是现在哪个省的商人?
【单选题】We all pay______our mistakes in some way at some time.
A.
off
B.
for
C.
back
D.
up
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