问题
选择题
| My mother bought me a nice sweater yesterday, now the sweater _______ me. |
A. is belonged t  o B. belongs to C. is belonging to D. belonged to |
答案
答案：B
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| My mother bought me a nice sweater yesterday, now the sweater _______ me. |
A. is belonged t o B. belongs to C. is belonging to D. belonged to |
答案：B
＝1.0m/s的速率逆时针转动。质量为M=1.0kg，长度L2=1.0m的木板上表面与小物块的动摩擦因数μ2＝0.4，下表面与水平地面间的动摩擦因数μ3＝0.1，开始时长木板靠近传送带B端并处于静止状态。现在传送带上端A无初速地放一个质量为ｍ＝1.0kg的小物块，它与传送带之间的动摩擦因数为μ1＝0.5，（假设物块在滑离传送带至木板右端时速率不变，sin37o＝0.6，cos37 o =0.8, g=10
）。求：