Adopting whorl driving can change circular movement to linal movement, and the automatic-locking function can ensure the using security, we develop the structure, analyze the principle, make necessary mechanics analyses, push over the formula, and make it clear that the jack is logical in structure, smart in power knighthead, durable in use, and with a big proportion of output and input.

利用蝸桿傳動人人摸人人舔人人爽、螺紋傳動，將轉(zhuǎn)動變換為直線運動天天人人夜夜操、將轉(zhuǎn)矩轉(zhuǎn)換為和向力欧美激情一区二区3区视频；同時利用螺紋傳動的自鎖作用，保證使用安全可靠欧美一级牲交黄片在线。結(jié)果設(shè)計出了多功能千斤頂?shù)闹饕Y(jié)構(gòu)欧美黑粗硬A片，分析了其工作原理，進行了必要的力學(xué)分析青春草在线视频按摩按，推導(dǎo)出數(shù)據(jù)計算的有關(guān)公式等十八以下静止观看的网站。

The text also investigates the intension of monorail vehicle knighthead and stability of the full support institution through analysis the force-received state when the monorail vehicle running on the ascent,decline and detour road during load and without load status.

通過分析空載和負載時，單軌車在水平国产美女精品视频线免费播放软件、坡度和轉(zhuǎn)彎三種路況上運行時的受力狀態(tài)欧美超级操B，研究單軌車支撐桿件的強度以及整體支撐機構(gòu)的穩(wěn)定性。

The sub-problem optimal way is used to optimize the mutual insert multi-span greenhouse and the optimal result is disposed using iterated algorithm. Through repetitious iterative disposing the optimal result of three kinds of loads to the mutual insert multi-span greenhouse, it is acquired that the arch pipe's diameter is 32mm, the knighthead's diameter 20mm, the mutual distance 60cm and the gradient side pole's horizontal projection distance is 50cm.

采用零階優(yōu)化方法對互插式塑料溫室的優(yōu)化計算結(jié)果進行多次迭代處理欧美性色A片免费，得到3種工況下的優(yōu)化結(jié)果：拱桿直徑為32mm8X国产在线观看；支撐桿直徑為20mm；互插間距為60cm欧美色天色噜夜夜；傾斜側(cè)桿的水平投影為50cm久久婷婷五月综合社区。