压下

It is free of the affect of the back pressure and can perform well under high back pressure.

不受背压的影响，在高的背压下能很好地工作。

This paper introduced the use of differential pressure meters which use a double cone as the primary differential pressure producer. Its typical structure helps the V-cone flow meter have strong ability of flow adjustment, and operate with good accuracy at low DP's.

差压式V锥流量计独特的结构使其具有较强的流动调整能力，可测湿气体，能在低差压下测量煤层气等显著优点，已在美国的煤层气工业开采中得到了大量的应用。

Transverse shear strain is introduced into the strain vector to take transverse shear deformation into account. To avoid shear lock,the one point Gauss integral method is used to compute the stiffness.

复合材料旋转壳体是航空、宇航和造船等常采用的结构形式之一，这类结构常常在轴压和侧压下工作，准确预测此类结构的屈曲临界载荷和破坏模式，具有重要的工程意义[1]。

Electronic structure and optical properties of gibbsite under different external stresses were calculated using CASTEP program.

用CASTEP程序计算不同外压下氢氧化铝的电子结构与谱学性质，分析外压对体系能带结构、态密度及光学性质的影响。

By comparing the dehydration methods of three catalytic esterification reactions and the catalysts used under negative pressure, the better method of synthesizing 2 ethylhexyl chloroacetate is using stannous oxide as catalyst under negative pressure.

通过对三种催化酯化反应的脱水方法及负压下使用不同催化剂的比较和选择，提出了以氧化亚锡为催化剂负压脱水合成氯乙酸2乙基己酯的方法。

The use of Fuji apples, and other high-end color in the early, usually in mid-September on the shop reflective film with bagging, to fruit, such as dredging of the supporting technology, the entire production Hongguo, the production tests, the following two methods Pumo Better:① will be reflective film in the shop under a tree-line on both sides, reflective film and the outer edge of vertical crown, tile floors, brick, stone and other压住edge, this method is suitable for close planting dwarf Park.

使用方法富士系等高档苹果在着色初期，一般在9月上中旬开始铺反光膜结合套袋、转果、疏叶等配套技术，生产全红果，经生产试验，以下两种铺膜方法较好：①将反光膜顺行铺在树下两边，反光膜与树冠外缘垂直，平铺地面，用砖、石等压住边缘，此方法适用矮化密植园。

The simulation results show that the asymmetry structure of the ratchet die cavity influences the BMG's flowing behavior greatly. During the material filling tooth cavity, dead zone volumes exist and situate on the areas with sparse teeth distribution. The full filling or not of the ratchet tooth tips, as the final filling region of the forming process, determines the super-plastic forming quality. Adopting smaller punch speed or longer load holding time is necessary for full filling of the tooth tips.

研究结果表明，棘轮模腔结构的不对称性对材料的流动行为影响显著；在材料向齿形的充填过程中存在流动死区，死区的位置处于齿形分布较稀疏的部位；齿形尖角是成形的最后充填部位，在终成形阶段采用较小的压下速度或较长的保压时间，有利于齿形尖角的完全充满。

Pressure Vent Valve installed at high level of vent stack with +3"-8" W.C. breathing parameter ensure to maintain system equilibrium

真空压力呼吸阀安装在排气管顶部，确保在+3&正压及-8&负压下操作以平衡油罐内压力

The influences of forming parameters,such as specification of heat treatment,nominal reduction of blank radius,feed ratio and roller track,on multi-pass neck-spinning of aluminum exhausted pipe used in vehicle are researched,and sound exhausted pipe s are developed by selecting reasonable processing parameters and roller tracks.

以铝质汽车排气歧管为研究对象，探讨了热处理工艺规范、名义压下量、进给比、旋轮运动轨迹等对三维非轴对称偏心及倾斜件多道次缩径旋压成形工艺的影响，通过选择合理工艺参数及旋轮运动轨迹，研制出合格的汽车排气歧管样件。

The drained behavior of Hokksund sand under low confining pressure was studied through static triaxial test, and the samples were prepared through the dry sedimentation method. The test results were corrected through the membrane effect which is often neglected under high confining pressure, the correction to axial stress for dense sample under a cell pressure of 10 kPa is equal to 12%.

采用干样沉降法制备样品，选用静三轴仪对松砂和密砂样在10kPa 至100kPa的低围压下的排水行为进行了实验研究，并对实验结果作了橡皮膜校正，在围压为10kPa的密砂实验中，轴向应力的校正值可达到12%。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。