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【单选题】
一截面抗弯刚度为【图片】 长为【图片】的简支梁上中点处作用有一个竖直的集中力【图片】的作用。记梁中的弹性弯曲变形能为【图片】, 若仅将该作用力大小改为【图片】,作用位置和方向都不改变,则梁中的弹性能为( )
A.
3U
B.
5U
C.
7U
D.
9U
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参考答案:
举一反三
【简答题】小麦蛋白质可按它们的溶解度分为清蛋白、球蛋白、_______、_______。
【简答题】Listening Exercises : (上面的音频8-1-1) C. Listento the conversations between guests and hotel employees. Match the guests with their room numbers and problems. (Please write down the room number and the ...
【简答题】Listening Exercises : (上面的音频8-1-1) C. Listento the conversations between guests and hotel employees. Match the guests with their room numbers and problems. (Please write down the room number and the ...
【单选题】对原子中的电子来说,下列成套量子数中不可能存在的是
A.
3 , 1 , 1 , -1/2
B.
2 , 1 , -1 , +1/2
C.
3 , 3 , 0 , +1/2
D.
4 , 3 , -3 , -1/2
【单选题】对原子中的电子来说,下列成套量子数中不可能存在的是()。
A.
3,3,0,+1/2
B.
2,1,-1,+1/2
C.
3,1,1,-1/2
D.
4,3,-3,-1/2
【简答题】Listening Exercises : (上面的音频8-1-1) C. Listento the conversations between guests and hotel employees. Match the guests with their room numbers and problems. (Please write down the room number and the ...
【简答题】Listening Exercises : (上面的音频8-1-1) C. Listento the conversations between guests and hotel employees. Match the guests with their room numbers and problems. (Please write down the room number and the ...
【单选题】一个有机化合物分子是否有旋光性取决于它是否具有
A.
手性碳原子
B.
双键
C.
对称因素
D.
苯环
【简答题】正常成人安静时收缩压为 ,舒张压为 ,脉压为 。
【简答题】Listening Exercises : (上面的音频8-1-1) C. Listento the conversations between guests and hotel employees. Match the guests with their room numbers and problems. (Please write down the room number and the ...
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