21s

Study of Milling Experiment on the Titanium Alloy of High Strength β 21s

β21s高强度钛合金的铣削试验研究

Heat Treatment and Cold Forming Properties of β - 21S Titanium Sheet

β-21S钛合金薄板材的热处理工艺和冷成形性能研究

Breeding of rice genic male sterile line SE 21S and its utilization

水稻核不育系SE21S的选育与利用

Hot Compressive Behavior of β 21S Titanium Alloy

β21S钛合金热压缩变形行为

The oil absorption cannot be influenced when the time was between 11s and 21s .

杀菌时间为11s到21s之间时对产品的持油性的影响不大。

The ocean is very important for existence and continuous development of human being . The 21S | century will be marine century .

海洋对人类的生存和可持续发展具有重要意义，21世纪将是‘海洋世纪’。

The size of the duck ovalbumin mRNA characterized by denaturing agarose gel electrophoresis was 21s .

用变性的琼脂糖凝胶电泳对各纯化步骤的核酸样品进行组成分析，确定出鸭卵清蛋白mRNA的大小约为21S。

Beta 21s titanium alloy was developed by TIMET company in America in recent years . It has many excellent properties , but its machinability is poor .

β21s钛合金是美国TIMET公司新研制的近β型钛合金，具有多种优良的机械性能和抗高温、抗腐蚀性能，但是切削加工困难。

The sedimentation coefficient of GS was 21S . MW of subunit of the enzyme obtained by SDS electrophoresis was 56,000 dalton .

酶的沉降系数为21S，SDS凝胶电泳测得酶的亚基分子量为56000。

The enterprise has to face competitor come from all around the world under the background of globalization in the 21s ' century . They must endeavor to improve quality of the product produced by them .

在二十一世纪全球经济一体化的背景下，企业要面对来自全世界的竞争对手，不断的改进本企业的产品质量，产品研发过程中的质量设计是企业改进产品质量的有效手段。

Severe acute respiratory syndrome ( SARS ) is a dramatic example of an emerging infectious disease in humans at the beginning of 21s ' century . Our country is one of the mostly epidemic areas .

严重急性呼吸综合征（severeacuterespiratorysyndrome，SARS）是人类在21世纪初遭遇的烈性传染病之一，我国为该病的重要疫区。

The result shows that the inhibiting time is 21s to 21s , while the inhibiting time of the passivated magnesium powder at the same condition is 11s to 14s .

结果显示，速凝镁粉阻燃时间为17～21s，而铣削-钝化镁粉阻燃时间为11～14s。

The generalized oscillator strengths of helium atom from the ground state to the excited states ( 21S , 21Pand 31D et al ) are calculated using the updated R-matrix codes within the first Born approximation .

本文在一阶Born近似下用最新的R矩阵程序以氦原子为例，计算了其从基态（11S）跃迁到激发态（21S，21P和21D）的广义振子强度。

β 21s is a new type of titanium alloy which has poor machining ability . In this paper , the tool wear and cutting force of milling was studied by experiment . The evaluation of machining ability and the optimized machining parameters were given out .

针对一种新型的难加工钛合金材料β21s，进行了刀具磨损试验和铣削力的测量试验，对材料的切削加工性进行评价，并且给出优选结果，为实际生产提供参考。