相对孔径

While a lens takes scattered beams of light and focuses them into a cone or ray it them projects on to film, a pinhole works by allowing such a small aperture that the beam coming in is quite small, and therefore remains relatively unscattered.

虽然镜头采取分散光束和重点成圆锥或射线是他们的项目，以电影，一个针孔的作品，让这样一个小孔径的光束将在相当小，因此仍相对

Materials and methods: The method of the electron grid therapy is to place a cerrobend grid on the end of an electron cone. Film dosimetry was used to measure the relative surface optical density and depth profile of grided electron beam with energies of 6 to 14 MeV.

材料与方法：使用底片测量术的方法，观察当15×15cm^2铅合金网眼板上的网眼孔径大小(d=0.45， 1.0， 1.5 cm)、网眼之间的间隔宽度(s=0.4， 0.2cm)不同时，以不同能量的电子射束(6、8、10、12、14 MeV)照射剂量50 M.U。，对底片的相对表面平均光密度及深度等光密度曲线分布情形所引起的变化。

Siltstone reservoir,which has fine grains,small aperture,low porosity and hquid-producing capacity,high maturity of rock component and structure,is one of the primary productive zone in the east oilfield of our country.

我国东部油田的粉砂岩储层是主要的产能层之一，储层具有颗粒细、孔径较小、孔隙度和产液能力相对较低的特点，储层岩石的成份成熟度和结构成熟度普遍较高。

During the 20042005 austral summer season, the absolute gravity and relative gravity were measured at the Great Wall Station. The tide gauge was set up in Zhongshan Station in 2000. The SAR interferometry was applied to build the DEM of ice sheet and to monitor the ice flow in the polar region.

具体介绍了以长城站、中山站和黄河站3个GPS观测站为依托，开展的板块运动、卫星定轨及极区大气环境监测方面的研究；GPS在埃默里冰架、格罗夫山及Dome A考察中的应用研究；长城站的高精度绝对重力及相对重力测量；中山站自动验潮站的建立；及合成孔径雷达干涉测量在南极内陆冰盖的应用研究等。

A compound camera lens with a relatively high aperture .

带有相对高孔径的照相机复合镜头。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了