不切實際 unrealistic; unpractical; impracticable; moot; not correspond with reality 不切實際的幻想 unrealistic notions; fanciful ideas; 不切實際的計劃 an impracticable plan
不切實際的 crackpot; impracticable; impractical; of the closet; quixotic; unpractical; unrealistic
Subsoil - field testing - part 4 : field vane test 心土.現場測試.第4部分:現場的十字板剪切實驗
Shearing experimental study of home - made safety pin for imported rolling mill 進口軋機自制安全銷的剪切實驗研究
Engineers " gyratory testing machine ( gtm ) of u . s corps was invented to solve questions which happened on flexible pavement , once used by the biggest and the most heavy bomber 美國工程兵旋轉壓實剪切實驗機( gtm )是美國空軍為解決最大最重的轟炸機柔性跑道容易出現問題而專門研究發明的。
Now some universities and institutes of china have made some samples of the lunar rovers and theirs wheels , but until now the wheel ’ s mechanical performance is seldom researched and tested . this paper will analyze the mechanical performance of the wheel and design a test - bed to test the performance of the lunar rover ’ s wheel . firstly , the mechanical characters of the soil are separated to press - sinkage character and shear character based on bekker ’ s theory , and common press - sinkage and shear models are introduced and the theory of lankine passive earth pressure is also introduced 根據bekker半經驗法的基本思想,將土壤的力學特性分解為水平方向的剪切特性和豎直方向的承壓特性,闡述了地面力學中常見的土壤的承壓、剪切等力學模型,并引入了朗肯被動土壓力理論,為建立車輪在松軟土壤中前進和轉向的力學模型奠定了基礎,同時進行了實驗土壤的剪切實驗,測量了土壤的內聚力和內摩擦角等參數。