Then, taking into account the effect of the compression of the approach roadway and the differential slope of the bridge slab, the author analyzes the dynamic response of man - vehicle - road system when the vehicle approaches and leaves the bridge by means of laplace transform, the curve of man ' s acceleration versus time, the vertical force between the vehicle and road versus time, the man ' s maximum transient vibration value and the maximum force between the vehicle and road are got, and the program about the calculating progress above are edited. based on the analysis above, the influence on the maximum transient vibration value of some parameters about the vehicle and road such as the movement direction and speed and weight of the vehicle, the differential slope of the bridge slab and the length of the approach slab, are studied, and some conclusion are given
分上橋和下橋兩種情況,考慮車路耦合和橋面沉降坡差的影響,對車輛通過設和不設搭板的路橋過渡段時「人?車?路」系統的相互
作用用拉普拉斯變換法進行了動力響應分析,得到了人的加速度及路面對車的垂
直作用力隨時間的變化曲線、人的加速度最大瞬態振動值和路面對車的最大
作用力,分析了車輛的行進方向、速度和載重,橋面沉降坡差和搭板長度等車和路各參數對計算結果的影響,並編制了相應的計算程序。
Radar is regarded as the mainly observation equipment of the two approaches which is used to supervise and identify ships
而雷達一
直作為這兩個方面主要的觀測設備,用來監測和識別船舶。
Firstly, this thesis was based on thoughts and theories of chemistry teaching material experiment parts of establishments that was discussed, and stressed on studying the united states reformation of the high school chemistry teaching material practices since half a century ; and summed up five characteristics on experiment parts of establishments : first has more than hours of the experiment lesson, and student need use half time do the experiment ; second is to emphasize strict and careful science attitude, and educate students as scientists to do the experiment ; third is that a chemistry experiment should face to the society, face to the life and face to the other related course ; fourth is that investigating types and its ability have been used as the important contents on chemistry experiment reform and development ; fifth is that chemistry teaching material establishment emphasize universal science and technique knowledge, and increase citizens chemistry science attainments
本文首先在論述化學教材實驗部分編制的思想理論基礎上,重點探討美國半個世紀以來中學化學教材的改革實踐,並總結出了其實驗部分編寫的五個特點:一是實驗課時較多,學生需用一半的學習時間做實驗;二是強調嚴謹的科學態度,教育學生象科學家那樣去做實驗;三是化學實驗面向社會、面向生活、面向其它相關學科;四是探究式學習和探究式能力培養一
直作為化學及化學實驗改革和發展的重要內容;五是化學教材編制強調普及科學技術知識,提高公民的化學科學素養。
The binaries will ideally be deployed from a build view in which in the objects were generated and will remain as view private objects
理想地,二進制代碼可以從構建視圖中獲得,該視圖中產生的對象將一
直作為視圖的私有對象。
He that walketh uprightly, and worketh righteousness, and speaketh the truth in his heart
2就是行為正
直,
作事公義,心裏說實話的人。
From 1956 to 1979, the 20 years of socialist economy has proven that if we adhere to the original plan of the economic structure and enterprise systems for a long time, the future and destiny of the state - owned enterprises will be precarious, unsustainable, and therefore reorganization is imperative to state enterprises
在近二十年的改革過程中,國有改革一
直作為整個經濟體制改革的中心環節。當前,國有企業走出困境的出路,不僅要繼續堅持企業改革方向,而且還要對國有經濟的布局進行調整,對國有企業存量資產進行重組。
Garlic has been hailed a wonder drug for centuries and has been used to preent gangrene, treat high blood pressure, ward off common colds and is een belieed by some to hae cancer - fighting properties
幾個世紀以來,大蒜一
直作為一種神奇的藥物,它可用於預防壞疽、治療高血壓、治愈普通感冒、甚至有抗癌
作用。
Garlic has been hailed a wonder drug for centuries and has been used to prevent gangrene, treat high blood pressure, ward off common colds and is even believed by some to have cancer - fighting properties
幾個世紀以來,大蒜一
直作為一種神奇的藥物,它可用於預防壞疽、治療高血壓、治愈普通感冒、甚至有抗癌
作用。
The lateral force should act perpendicular to the measuring axis at the point where force is introduced
側力應垂
直作用在力引入點的軸上。
Smoothing is that passenger feel some comfortable when vehicle vibrating on the rough road. travel reliability has some relation to vertical force of ground on tyre, that is, the force become zero when tyre separate from ground, which makes it difficult to handling vehicle. consequently it will influence the traveling safety
汽車在行駛過程中由於不平路面激勵而產生振動,平順性是指乘員在該環境中具有一定舒適度的性能;行駛安全性與地面對輪胎的垂直作用力有關,如果該作用力為零,即輪胎脫離地面,將給汽車的操縱帶來困難,因此影響汽車行駛的安全;懸架動行程在汽車行駛時不能太大,即應在預留空間之內,以保證汽車正常運行。