阶梯形曲线

It features in the stair type rotary adapter between the wind blast end and reducing wind pipe, the conic section of the horizontal profile of the inner cavity of the wind blast end, and linear design of the longitudinal profile, with wind shroud equipped at each exhaust outlet of the wind blast end.

本发明技术特征是送风末端与变径风管之间设有阶梯形可旋转联接器，此外，送风末端内腔的横截面为2次曲线，纵截面为流线型设计，并在送风末端的出风口处设有均风罩。

Research also provides a finite element method for the study of masonry walls seismic behavior. Firstly, through the stone-dust mortar compressive experiment, pressure experiment, blocks bending experiment, water blocks experiment, 3 slabs shear experiment, diagonal loading experiment and the compression experiment, the values of compressive strength, bending strength, average water weight are obtained. Then the shear breakage of the masonry, behavior of shear stressτvaring withσ, load-displacement curves, ladder-shaped slit shear strength, shear strength of links linking, compressive strength and elastic modulus are also presented.

首先通过石头粉砂浆抗压试验、砖块压力试验、砖块抗折试验、三砖抗剪试验、对角加载试验、短柱的承压试验等测得了石头粉砂浆的抗压强度，砖块的抗压强度，砖块的抗弯强度，以及砌体剪切破坏形态、剪应力τ随正应力σ的变化规律、砌体对角压墙片的载荷-位移关系曲线、阶梯形缝抗剪强度及通缝抗剪强度和弹性模量。

The pneumatic percussive steerable mole adopts the percussion part of the underground mole, which has a bi-stable steering head updated from the old symmetrical stepped head. So it can construct along a curve path and implement deviation correction.

其中，气动冲击式轨迹可控穿孔机采用了地下穿孔机的冲击部分，并将其原来的对称式阶梯形冲击头改进为具有导向功能的双稳式导向穿孔头，从而使穿孔机可以进行曲线轨迹施工以及当发生偏离时可以进行纠偏。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。