題庫堂
檢索
題庫堂
首頁
數學
英文學習
政治學
統計學
經濟學
藥理學
中醫藥物學
財政學
法學知識
公共行政
警察學
BI規劃師
財務管理
公共衛生學
工程經濟學
電力電子學
當前位置:
首頁
2•在平面上有一力 ,作用在A點,A點在直角座標X-Y上 位置為(-5,10),試求此力對座標原點(0,0)之彎矩?(註:[ 為 垂直於X-Y平面Z軸之單位向量)(A) 55 (B) -55 (C)9
問題詳情
2•在平面上有一力
,作用在A點,A點在直角座標X-Y上 位置為(-5,10),試求此力對座標原點(0,0)之彎矩?(註:[
為 垂直於X-Y平面Z軸之單位向量)
(A) 55
(B) -55
(C)90
(D) -90
參考答案
答案:D
難度:困難0.285714
統計:A(2),B(2),C(4),D(4),E(0)
用户評論
【用戶】
Boomer
【年級】國三上
【評論內容】圖(2)是第三題的圖,建議移到第三題
上一篇 :
【題組】26. Andy’s teacher can’t _____ his bad behavior at school.(此題選錯)(A)tolerate (B)endure (C)reveal
下一篇 :
【題組】12. I asked about his occupation and he said he was an accountant.(A)foundation (B)admission (C)
資訊推薦
【題組】36. A: Ken and I are thinking of organizing a band. B: Sounds cool. ________A: Yes, a keyboardis
【題組】45. (A)universe (B)globe (C)continent (D)ocean
【題組】27. For safety’s sake, you should _____ the brakes of your car soon. (A)request (B)relate (C)rel
【題組】18. These pills _____ my headaches almost immediately. (A)concentrate (B)fatigue (C)relieve (D)e
【題組】13. It was good news for HTC when a British court decided to reject Apple’s claims that they cop
【題組】37. A: Mom, I’m going to run the marathon with Joe next Sunday.B: That’s great. ________A: Yes,
In the summer of 2011, NBA league owners clashed with players 46 how much the athletes should be pai
【題組】28. The traffic lights are devised to _____ people’s behavior on roads. (A)upset (B)regulate (C)
【題組】19. He is suffering from _____ problems and claims he can see ghosts. (A)mature (B)mental (C)rea
【題組】14. Julia wanted to buy a new iPad, but she _____ when seeing the high price, which she couldn’t
【題組】38. A: You should write your own report instead of copying others’ words from the Internet. B: _
【題組】47. (A)resulted from (B)led to (C)turned to (D)stuck to
【題組】29. The _____ of an old, deserted building occurred right after an earthquake last night.(A)cons
【題組】20. The French restaurant has a very romantic _____. (A)atmosphere (B)depression (C)routine (D)f
【題組】15. His biggest _____ in life is that he didn’t spend much time with his mother before she died
【題組】39. Lance: It’s a very bad habit to cheat on a test. ________ Next time, I’ll tell the teacher.N
【題組】48. (A)comprise (B)to comprise (C)comprising (D)to be comprised
【題組】30. Please follow the proper ______ when applying for a loan so your application can be accepted
【題組】21. Being able to speak several languages gives you a _____ advantage. (A)gross (B)classical (C)
【題組】16. Cindy has a strong _____ for physics, and she hopes to be physicist in the future.(A)passion
【題組】40. A: ________, Son! I just mopped the floor. B: Too late, Mom...oh, it hurts!(A)Never mind (B)
【題組】49. (A)go (B)goes (C)going (D)is going
二、對話(10%,@1%)【題組】31. A: Give me the keys to your car. You’re not driving.B: Don’t worry about it. I’
【題組】22. _____ has been increased at all airports after the latest terrorist attack.(A)Community (B)A
三、克漏字測驗(20%,@1%)It seems that time travel is impossible. Scientists at Hong Kong University of Scien