—_____ —He is creative and outgoing. |
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A.What is the new teacher? B.What is the new teacher like? C.What does the new teacher do? D.What does the new teacher look like? |
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你能帮帮他们吗
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质点的运动方程为r=4t^2i+(3+2t)j(m),t以s记.求 ①质点的轨迹方...
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