题目内容

Listen to a short coversation and choose the best answer to the question you hear.[音频]

A. They can get clues to our past from old family pictures
B. They are only interested in important events and people
C. They like the 20th-century photographs
D. They like studying ordinary people's family history

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Listen to a short coversation and choose the best answer to the question you hear.[音频]

A. He should have taken more courses
B. He will probably fail the test this Friday
C. He is not good at playing games
D. He should remember all those names and dates

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等强度梁各个横截面上的（）。

A. 最大正应力相等
B. 最大正应力相等且等于许用正应力
C. 最大切应力相等
D. 最大切应力相等且等于许用切应力

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提高等截面梁强度的有效措施是（）。

A. 若梁中只有正的弯矩,则采取措施使正弯矩变为负弯矩
B. 若梁中有一最大的正弯矩,同时有一-最大的负弯矩,则采取措施使两者的绝对值尽可能接近
C. 将梁的材料由低质钢改为优质钢
D. 增加梁的支座使梁成为超静定梁
E. 若T形截面梁的材料是塑性材料,则可将其改为矩形截面梁
F. 若矩形截面梁的材料是脆性材料,则可将其改为T形截面梁,并将梁的中性轴偏于受拉一侧放置

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铸铁梁受弯时，梁的横截面中性轴一般应设计成不对称的，其形心位置应偏向（）侧更为合理。【受拉或受压】

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Listen to a short coversation and choose the best answer to the question you hear.[音频]

A. They can get clues to our past from old family pictures B. They are only interested in important events and people C. They like the 20th-century photographs D. They like studying ordinary people's family history

Listen to a short coversation and choose the best answer to the question you hear.[音频]

等强度梁各个横截面上的（）。

提高等截面梁强度的有效措施是（）。

铸铁梁受弯时，梁的横截面中性轴一般应设计成不对称的，其形心位置应偏向（）侧更为合理。【受拉或受压】

A. They can get clues to our past from old family pictures
B. They are only interested in important events and people
C. They like the 20th-century photographs
D. They like studying ordinary people's family history