皮皮学，免费搜题
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【单选题】
如图，有一传动皮带轮，其左轮为轮轴，大轮半径为4r，半径为2r。b为上的一点，到轴心距离为r。c和d两点分别位和的边缘上。右边轮子的半径为r，a为其边缘上的一点。若运转过程中皮带不打滑，那么以下结论正确的是【图片】
A.
a 点和 d 点向心加速度大小相同
B.
a 点和 b 点线速度大小相同
C.
a 点和 b 点角速度大小相同
D.
a 点和 c 点角速度大小相同
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皮皮学刷刷变学霸
举一反三
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B.
错误
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【单选题】— Why are you still here? Everybody has gone to attend the lecture by the president. — Oh, I_____
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26．— Why are you still here? Everybody has gone to attend the lecture by the president. — Oh, I__________about it! A．wasn’t informed
B.
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haven’t informed
D.
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【单选题】— Bob isn’t feeling well. He has caught a cold. — Everybody seems to have ____ because of the changeable climate in spring here.
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that
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it
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【单选题】Theres no reason to love the people who live next door to you, because people______.
A.
are frequently moving
B.
are always too busy to do that
C.
are hostile
D.
always live far away from each other
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【多选题】桑代克的“试误说”中提出的学习的规律包括( )。
A.
准备律
B.
动机律
C.
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D.
效果律
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【判断题】变压器负载运行时，原边和副边电流标幺值相等。()
A.
正确
B.
错误
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【单选题】---Why are you still here? Everybody has gone to attend the lecture by the president. --Oh, I ___________ about it!
A.
wasn’t informed
B.
hadn’t been informed
C.
haven’t informed
D.
didn’t inform
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【简答题】“金狮”牌皮带，牛皮制
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查看完整题目与答案