性交

First the math theory of machining simulation is studied, and the set structure of NC machining simulation system whose components, including time, input, output and so on, are defined. Hereby we set up the hierarchy structure, the logical structure, the static model and the dynamic model of simulation system. The construction method of sweep entity of cutter and rotation parts is researched, and their differential geometry invariants are calculated. NC code is unscrambled, and the recursion division arithmetic of time segment is put forward, which is the driven data of the movement or rotation parts. The CLDATA should be interference-free. To examine if there is interference between cutter flank and the work piece, an arithmetic that discussed the existence of intersecting curve between them is put forward. To examine if there is interference between two turrets, an arithmetic that discussed the existence of intersection set between two polygons is put forward.

首先研究加工过程仿真的数学基础，然后定义数控加工仿真系统的集合结构及时间集、输入集、输出集等概念，建立加工仿真的层次结构和逻辑结构，阐述双刀车削仿真系统的静态模型和动态模型建立方法，分析刀具扫描体和旋转部件扫描体的建立方法及其微分几何性质；研究NC代码解读技术和双刀加工时间段递归子分划技术，为驱动各仿真单元作数据准备；通过讨论后刀面和工件表面交线的存在性判断刀具后刀面与工件间是否干涉，通过求多边形的交集判断刀架与刀架是否干涉。

The internal cause includes polarity variation , inbred variation , instability of hybridization and gene mutation . The external cause includes unfitting culture conditions , strain ag ing , unsuitable preservation and infection virus of asexuality propagation .

内因主要包括极性发生变异，自交产生的变异，杂交种性不稳定和基因突变；外因主要包括培养条件不适宜，菌种老化，菌种保藏不当和菌株无性繁殖体感染病毒。

With an orthogonal experiment design , the telomerase inhibitors [azidothymidine , AZT 300 mg/ and lamivudine 150 mg/, per os , bid ,×2 weeks ] and X2irradiation [ total dose 10 Gy (2 Gy ×5) in 1 week ] were used to treat BALB/ c mice carrying breast cancer MA782 for evaluating the influence on peripheral blood cells , bone marrow nucleated cells and telomerase activity.

为了探讨端粒酶抑制剂联合X 线照射对荷瘤小鼠的骨髓抑制作用，采用正交实验设计，应用端粒酶抑制剂[AZT 300 mg/， lamivudine 150 mg/ ]联合X 线照射(2 Gy ×5次/ 1 周)处理移植性乳腺癌(MA782 )小鼠，观察其对骨髓有核细胞、外周血像及骨髓端粒酶活性的影响。

Experimental results based on backcross population indicated that the sensitivity and specificity of PCR marker were almost as same as that of RFLP marker.

回交后代的鉴定结果表明，该PCR标记的灵敏度和专化性与RFLP标记基本相同。

The energy-orthogonal character of Wilson element,Q_1 element,rotated Q_2 element,Bergan 9-parameter triangular element[6],5- parameter[23] and 8-parameter rectangular element[20] is analysed in this paper.

全文提供：购买充值卡，就可下载本篇论文全文中文摘要：本文分析了Wilson元，Q_1元，旋转Q_1元，Bergan 9参三角形元[6]，5节点元[23]和8参数矩形元[20]的能量正交性。

SLG and SRK are thought to be the key molecules of self-incompatibility in Brassica.

位点糖蛋白基因和S受体激酶基因是控制芸薹属植物花柱自交不亲和性的两个关键因子。

However, technically speaking,"buggery" can be any form of sexual stimulation of the anus.

不过，从技术上来说，"肛交"可以是任何形式的对肛门的性刺激。

Buggery was also seen as a high-risk sexual behaviour.

肛交也被看作是一种高风险的性行为。

"Buggery" is usually used to describe two men as a sex party to the penis, fingers or fake penis inserted into the other side of the anus.

"肛交"一词通常是用于描述两个男性之间的一种性行为，一方把阴茎、手指或假阳具插入到另一方的肛门内。

If you suspect are infected with AIDS themselves, be the first recall whether they had a "dangerous act"(referring primarily to unsafe sex, such as prostitution, sexual contact with individuals, buggery, etc.; sharing dirty needles with intravenous drug users ; to accept the possibility of contaminated blood or blood products; strict disinfection without the use of needle or other equipment likely to cause bleeding, such as razors, and tattoo wear ear apparatus; of pregnant women infected with HIV give birth, etc.).

如果怀疑自己感染了艾滋病，可首先回顾自己是否有过"危险行为"(主要指不安全的性行为，如卖淫嫖娼、与多个人有性接触、肛交等；共用不洁针具静脉吸毒；接受有可能被污染的血液或血制品；使用未经严格消毒的针具或其他可能引起出血的器械如剃须刀、穿耳针及纹身器具；感染艾滋病病毒的孕妇分娩等)。

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％。