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Because there is less gas pressure exerted on the valve stem.

在单级减压阀里，输出压力随钢瓶压力的减小而增大，这是因为施加在阀门系统上的气体压力减

Back pressure :The pressure exerted on the downstream side of a valve seat.

背压力：作用于阀门下游侧的压力。

For the high tensile bolt connection between girders and carriages of double girder overhead traveling crane with electric hoist, this paper analyzes the forces exerted on the bolts and gives their strength check procedures.

摘要介绍了葫芦双梁主梁与端梁连接的高强度螺栓的校核过程，通过分析高强度螺栓的受力特点，建立校核模式，总结校核步骤及方法。

Mowing suppressed seedling emergence of tall-growing Stipa krylovii by affecting seed availability due to reproductive parts removal when mown in the previous year, whilst exerted a positive effect on low-growing Cleistogenes squarrossa probably as result of increased light availability and less competitive pressure from adult individuals, because mowing largely lowered the vegetation height and density. 3."U"shaped curve for seedling mortality across the entire growing season was thought to be associated with seasonal changes of air temperature but a small peak from mid-June to early July could probably be attributed to drought due to previous rainfall shortage.

自5月下旬至8月中旬，三种禾草的实生苗密度总体上都呈上升趋势，但刈割和放牧会使克氏针茅的实生苗密度受到抑制，表明前一年的刈割去除部分生殖器官影响形成实生苗的种子来源；刈割和放牧对生长较低矮的糙隐子草实生苗会产生正向效应，对低矮和稀疏植被进行有规律的刈割会增加植物群落内部的光照，减轻实生苗与成年母株的竞争。

The motor's overload ability is exerted and the stable temperature rising of the motor is realized, which fulfills the demand of numerical control electrical screw press.To fulfill exact control on strike energy and block position, a high performance numerical control software system is essentially needed.

为此，作者将模块化的程序设计方法引入到数控电动螺旋压力机的软件系统中，各个功能模块相互独立，实现了软件系统的开放性和体系结构可复用性的目的。

The inefficiency problem during cold rolling of titanium sheet without tension exerted on it was investigated. The state equation of stress of titanium sheet under tensional effect is deduced on the basis of Hill's anisotropic yield criterion in combination with the anisotropic characteristics of titanium s mechanical properties.

针对钛板在无张力条件下冷轧效率低下的问题，首先结合钛材力学性能各向异性的特点，以Hill异性屈服准则为基础，推导出钛板在张力冷轧下的应力状态方程，从而在理论上阐明，钛板在张力条件下进行冷轧的可行性主要取决于其塑性变形条件及其所处的应力状态。

I almost exerted all of my strength to open the box, but still could not!

我几乎用尽全身力气去打开这个盒子，可就是怎么也打不开！

These feed steam through the straight passages in the piston to the two working volumes 3 and 2 at appropriate times, and force is exerted on the spring-loaded shutter sticking out of the cylinder.

这些饲料的蒸汽通过直通道，在活塞向两个工作卷3和2个在适当的时候，和武力施加于弹簧加载快门伸出的圆柱。

If the spring pressure pad is used without the spacer, the more the springs are depressed the greater the pressure exerted on the blank, thereby linmiting the depth of dtaw.

如果春运压力垫，是用无间隔，更是泉水患上抑郁症，越是施加压力的空白，从而linmiting深度dtaw 。

The results showed that under the same polishing parameters, the particle size exerted an important influence on MRR and surface quality during unfixed-abrasive polishing, but played a less role during fixed-abrasive polishing. A fine surface roughness of R 1.5 nm was achieved by using diamond fixed-abrasive pad, and the function of self-conditioning was well realized.

结果表明：在相同的抛光工艺参数下，磨粒粒径在游离磨料抛光中对材料去除率和抛光后表面质量作用显著，而在固结磨料抛光中作用不显著；采用金刚石固结磨料抛光垫抛光能获得表面粗糙度约为R1.5 nm的良好表面质量，并在抛光过程中较好地实现了自修整功能。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。