年級

問題的種類

英文 高中

想問一下這幾題是甚麼概念謝謝😇😇 第23題答案是B 第19題答案是D

The Internet has replaced books as a major source of information for Taiwanese primary school students, according to a recent survey. The survey was conducted last December, and it that 77 percent of the students considered the Internet to be the most convenient source of information. 14 percent of the respondents said they often 7 books for information instead of going online. Of all the students surveyed, 27 percent said they had never used the 18 The survey randomly selected 4,200 students in 26 primary schools in investigate their reading habits. A total of 4,017 questionnaires were properly 20 parts of Taiwan to by the respondents. According to the survey, five percent of the school children indicated that they did not read any reading materials. Of those who read such materials, 25 percent liked to read comics, 20 percent fables and stories, 15 percent books on natural sciences, and 12.3 percent books on technology. The survey indicated that 45 percent of the school children read at least five books every month; 45 percent of them read less than three per month. (A)took (B)put (C)knew (D)found (A)used up (B)went off (C)turned to (D)made into (A)Net (B)survey (C)books (D)respondents (A)various (B)convenient (C)youthful (D)routine 20((A)taken in (B)given off (C)filled out (D)picked on (D)(A)story (B)comic (C)technology (D)extracurricular 2( )(A)thus (B)further (C)otherwise (D)for instance (A)other (B)another (C)others' (D)the other's 課堂筆記:

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工程與科技 大學

各位大神 求解 拜託🙏🆘

CA 梁柱 一截面積是原來的兩倍 22. Two girders are made of the same material. Girder A is twice as long as girder B and Bo DE C B³ has a cross-sectional area that is twice as great. The ratio of the mass density of girder A to the mass density of girder B is: 質量密度 A) 4 B) 2 C) 1 D) 1/2 E) 1/4 29. During a short interval of time the speed v in m/s of an automobile is given by v=at² + bt³, where the time t is in seconds. The units of a and b are respectively: A) m-s²; m-s4 s³/m; s4/m dv=at+bt² B) C) m/s²; m/s³ D) m/s³; m/s4 E) m/s4; m/s5 34. The position y of a particle moving along the y axis depends on the time t according to the equation B) C) D) E) 質固定,体2倍 #%# 40. The coordinate of an object is given as a function of time by x = 7t-31², where x is in meters and t is in seconds. Its average velocity over the interval from t = 0 to t = 2 s is: A) 5 m/s X₂=0, X₁₂=14-12=2 B) -5 m/s 11 m/s C) D) -11 m/s (2-0)/2=1 E) -14.5 m/s 41. The coordinate of a particle in meters is given by x(t) = 16t-3.01³, where the time t is in seconds. The particle is momentarily at rest at t = A) 0.75 s A y = at -bt². The dimensions of the quantities a and b are respectively: A) L²/T, L³/T2 B) L/T², L²/T C) L/T, L/T² D) L³/T, T²/L E) none of these 1.3 s 5.3 s 7.3 s 9.3 s V(t) = 16-9+² =- [9t²-16) =-(3t+4) 13t-4) =+= 0.75 45. The velocity of an object is given as a function of time by v = 4t-312, where v is in m/s and t is in seconds. Its average velocity over the interval from t=0 to t=2 s: A) is 0 B) is -2 m/s C) is 2 m/s D) is -4 m/s E) cannot be calculated unless the initial position is given 49. A particle moves along the x axis according to the equation x = 61² where x is in meters and t is in seconds. Therefore: E B) C) D) E) A) the acceleration of the particle is 6 m/s² t cannot be negative the particle follows a parabolic path each second the velocity of the particle changes by 9.8 m/s none of the above

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