双射

Points out that the propagational derection and vibration surface of ordinary and extraordinary ray in crystal can be determined by the characters of wave surface in crystal and Huygens,Construction.

本文研究单色自然光入射到单轴晶体后产生双折射现象，所得的O光和e光在晶体内的传播方向和振动面，可利用晶体中波面的特点和惠更斯作图法来确定，使读者对这一问题有更进一步的认识和理解。

Competition among four-wave mixing with two dressing fields, the six-wave mixing with one dressing field as well as the eight-wave mixing propagating along the same direction can be evoked by adjusting laser beams because these multi-wave mixing signals are induced by atomic coherence between common levels.

研究发现，通过调节激光束方向，沿同一方向出射的八波混频、双缀饰四波混频和单缀饰六波混频信号因共用能级的原子相干产生而出现竞争现象，通过控制缀饰场减弱四波混频和六波混频信号强度，可以达到增强八波混频信号的目的。

Methods On the symmetrical plane of the double-Gauss lens with 1:1 magnification,the Fraunhofer diffraction of the object surface could be formed.

方法在双高斯1：1制版镜头的对称面上形成物面的夫朗和费衍射，并使物面与茶形散斑屏重合，使得各物点均以狭缝状的光束通过透镜组在记录介质面成像。

A PC_401 computer system was introduced to the double crystal goniometer for small angle scattering measurement.

对双晶衍射仪实行改造，用一台PC＿401微机直接控制和进行小角散射等测量。

The fracture features and interfacial microstructures of explosively welded Pt/Ti and postrolling progress have been studied by TEM, SEM, XRD and EDXA. The explosive welding interfacepossess some inconsecutive new phases. The phases are PtTi, PtTi3,Pt5Ti3 and so on, which havehigh strength. Tensial fracture position is located at the hoe of Pt.

用扫描电镜、能谱、X射线衍射仪对Pt／Ti爆炸焊接及爆后轧制双金属断面形态与界面结构进行的分析表明：爆炸焊接界面上有断续的新生化合物层，此层是由PtTi、PtTi3、Pt5Ti3等化合物组成的混合组织，有很高的结合强度，强制拉断在界面Pt侧。

These distributions show that the electrons lie mainly in the scattering plane which are observered to be preferentially emitted in the forward direction, lying between 0 and projectile velocity Vp. The distributions also display the typical two-fingered structure with a local minimum on internuclear axis.

结果表明：电子主要集中在散射平面内；在散射平面内，电子速度分布介于0和入射炮弹速度Vp之间且在炮弹和靶核核间轴处有一极小值，呈现出典型的双峰结构。

Among which, there are cold-box core shooter, core-assembly robot and core-coating manipulator all from Hottinger Company of Germany; The sand preparation equipments are a German maid sand mixer form Eirich Company and a Swiss made Simpson double-chamber cooling device; For moulding, a fully automatic moulding line is imported from HWS Company of Germany; The melting equipments use medium-frequency induction furnace from Junker Company of Germany.

主要生产设备均为进口设备，其中制芯设备有德国Hottinger公司的冷芯盒射芯机、组芯机器人和浸涂机械手；砂处理设备主要有德国Eirich公司的混砂机和瑞士Simpson公司双盘冷却机；造型设备主要有德国HWS公司的静压自动造型生产线；熔化设备主要有德国Junker公司的中频感应电炉；清理设备主要有意大利Pangborn公司的机械手抛丸机；主要检测仪器有：真空真读光谱仪，红外碳硫仪，型砂在线检测仪等，具备高质量控制水平，产品质量处于国内同行领先地位，优于玉柴原来进口毛坯水平，替代进口。

From the little lean-to kitchen the sound of the sputtering suddenly ceased, and at the door appeared a pair of dark, wistful eyes.

从这个小瘦到厨房的声音突然停止溅射，并在门口出现了一个黑暗的，令人向往的一双眼睛。

In recent years, companies step up the development of the fast lane: the completion of the production run has been an annual output of 150,000 tons of pig iron smelting companies; under construction, the modernization of 30,000 tons annual output of castings and machining parts auto parts company has advanced Vertical shot molding pressure, the level of sub-type microseism compaction modeling line, self-hardening resin sand molding line, dual power supply frequency melting furnace, sand automated treatment systems, as well as CNC machining centers and machining equipment production lines production equipment, with direct-reading spectrometer, casthouse Express analyzer, Coordinate measuring instrument, ultrasonic flaw detector such as the modernization of non-destructive testing equipment and a full range of conventional detection equipment; at the same time the company has a skilled use of CAD / CMD technology design, manufacturing, machining workforce and more than ten years such as day, love and respect their jobs, and accumulated rich experience in foundry staff.

近年来，公司步上了发展的快车道：建成了已投产运行的年产15万吨生铁的冶炼公司；正在建设的现代化的年产30000吨铸件和机加工件的汽车零部件公司拥有先进的垂直分型射压造型线、水平分型微震压实造型线、自硬树脂砂造型线、双供电中频熔化炉、自动化的砂处理系统以及加工中心和数控设备组成的机加工生产线等生产设备，拥有直读式光谱仪、炉前快速分析仪、三坐标测量仪、超声波无损探伤仪等现代化的检测设备和齐全的常规检测设备；同时公司拥有一支熟练运用CAD/CMD技术进行设计、制造、机械加工的员工队伍和十几年如一日、爱岗敬业、积累了丰富经验的铸造员工队伍。

As to the asymmetry phenomenon of current duplex communication terminal of wireless communication systems in the short-range open segment,intelligent RF transceiver dual-use hardware terminal system is designed.

针对目前短程开放段无线通信系统双工通信终端不对称现象，设计智能化无线射频收发两用硬件终端系统。

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％。