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8.如图,光滑斜面固定于水平面,滑块A、B叠放后一起冲上斜面,且始终保持相对静止,A上表面水平。则在斜面上运动时,B受力的示意图为( )
問題詳情
8.如图,光滑斜面固定于水平面,滑块A、B叠放后一起冲上斜面,且始终保持相对静止,A上表面水平。则在斜面上运动时,B受力的示意图为( )
參考答案
答案:A
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
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20.火法炼铜首先要焙烧黄铜矿,其反应为:下列说法正确的是 (A)SO2既是氧化产物又是还原产物 (B)CuFeS2仅作还原剂,硫元素被氧化 (C)每生成1 molCu2S,有4mol硫被氧化 (D)
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16.如图,可视为质点的小球A、B用不可伸长的细软轻线连接,跨过固定在地面上半径为R有光滑圆柱,A的质量为B的两倍。当B位于地面时,A恰与圆柱轴心等高。将A由静止释放,B上升的最大高度是( )(A)2
資訊推薦
17.三.多项选择题(共16分,每小题4分,每小题有二个或三个正确选项,全选对的,得4分,选对但不全的,得2分,有选错或不答的,得0分,答案涂写在答题卡上。)直流电路如图所示,在滑动变阻器的滑片P向右
27. When I first met Byan I didn't like him, but I _______ my mind.(A)have changed (B) change (
21.常温下a mol/L CH3COOH稀溶液和b mol/L KOH稀溶液等体积混合,下列判断一定错误的是
【題組】37. (A)cure (B) prevent (C)adopt (D)analyze
28. The driver wanted to park his car near the roadside but was asked by the police _______.(A)not t
18.位于水平面上的物体在水平恒力F1作用下,做速度为v1的匀速运动;若作用力变为斜面上的恒力F2,物体做速度为v2的匀速运动,且F1与F2功率相同。则可能有(
【題組】38. (A)instead (B) strangely (C)as usual (D)like me
29. The door _______ open, no matter how hard she pushed.(A)shouldn't (B) couldn't (C)woul
【題組】47. (A)flexible (B) safe (C)starting (D)comfortable
一、圖書館對於電子資源的採購除了自行購買或委外採購外,最重要的趨勢是以加入聯盟﹙Consortium﹚的方式集結其他圖書館共同採購,試說明參與聯盟的優點與應注意事項。(25分)
【題組】39. (A)learning (B) working (C)satisfying (D)relaxing
30. Athe last moment, Tom decided to _______ a new character to make the story seem more likely.(A)p
【題組】48. (A)yet (B) just (C)still (D)even
【題組】57. What can we learn about the author?(A)She rarely misses a good deal.(B) She seldom makes a c
22. They might just have a place _______ on the writing course — why don't you give it a try?(A
【題組】40. (A)convenient (B) awkward (C)boring (D)exciting
31. India attained _______ independence in 1947, after _______ long struggle.(A)不填; a (B) the; a (C)
【題組】49. (A)shown (B) pushed (C)driven (D)guided
【題組】58. What does the author do?(A)She's a teacher.(B) She's a housewife.(C)She's a m
23. Try not to cough more than you can _______ since it may cause problems to your lungs.(A)check (B
【題組】41. (A)height (B) force (C)skill (D)weight
32. There's no way of knowing why one man makes an important discovery _______ another man, als
【題組】50. (A)realized (B) suggested (C)agreed (D)admitted
【題組】59. What does the author want to tell us?(A)How to expose bad tricks.(B) How to reserve airline
24. If we _______ now to protect the environment, we'll live to regret it.(A)hadn't acted