选择

It can be concluded that to meet with the ideal separation effect in a relative short period, the following optional selection of experimental conditions should be carried on strictly: centrifuge rotor and gradient medium, which will influence separation capability; gradient density range, shape and slope, which is very important in separation degree; the methods of reorienting rotor,low and high rotor speed exchange and Gmax could be used in order to shorten separating time.

通过研究认为在相对短的时间内要达到理想的分离效果，应该对以下实验条件进行优化选择并严格控制：包括实验中影响分离本领的转头、梯度介质选择；为获得满意分离度应严格选择梯度的密度范围、梯度形状以及梯度的斜率；为了缩短分离时间，可采用重定向梯度、二次变速及Gmax等方法。

Considering no construction analysis oriented software for long-span space structures exists in the domestic engineering software market in China, a constructionmodule is developed upon the platform of MSTCAD, a famous domestic software for space grid structures design. This will not only enhance the software functions, but also meets the growing domestic demand for construction analysis software.

最后，针对目前国内大跨度空间结构施工分析软件缺乏的现状，在MSTCAD软件平台上增加施工功能的吊装模块，在模块中实现吊装的目标函数满意度选择起吊高度功能和最小应变能法选择吊点布局的功能，并且通过各类吊装参数的预输入给予用户方便快捷的选择，使得MSTCAD软件逐步完善成为国内领先的设计及施工分析软件。

According to SIT, we could make the following hypotheses on the social behavior of a state: the state will favor in-group countries, take win-win strategy with the group it identifies, and be prone to cooperation in bilateral relations; the state will take non-zero-sum strategy with out-group countries and choose partially participation and cooperation; for the out-group countries with high hostility, the state will take zero-sum strategy, and choose non-cooperation or conflict.

根据社会身份理论，我们对国家的社会行为提出了如下假设：国家会更偏向于内团体国家，对于自己所认同的国家集团会从双赢的思维出发，选择积极合作的战略；对于外团体国家，一般会从非零和的思维出发，在双边事务中选择部分的参与和合作；而对于敌对性较高的外团体国家，一般会从零和的思维出发，在战略上选择不合作或冲突。

PDF2CAD features ability to accurately reproduces PDF vector geometry in DXF format, preserves curves as splines in DXF output, preserves PDF font text as searchable and editable text in DXF output, option to merge characters into words and one-line text strings, option to outline font text to vector paths in DXF output, option to apply font name mappings during conversion, and ability to extracts embedded raster images to separate TIFF or JPEG files, referenced in the DXF output.

pdf2cad功能的能力，准确地抄录PDF格式向量几何在DXF格式，保留作为样条曲线在DXF格式输出，保存PDF格式的字体的文字作为搜索和编辑文本在DXF格式输出，可以选择合并字符的话和一网上的文字字串，选择Outline字体的文本载体的路径，在DXF格式输出，选择申请字体名称映射转换期间，有能力提取物嵌入式栅格图像分开， TIFF或JPEG文件，引用，在DXF文件输出。

Secondary variables selecting method based on PCA is researched, and then secondary variables selecting method based on Partial Least-Squares Regression is proposed.

并且研究了基于主元分析的辅助变量选择方法，提出了基于偏最小二乘回归的辅助变量的选择方法，采用两种方法分别对常压精馏塔航空煤油干点的辅助变量进行了选择比较。

At this point, you can select the move tool, place a check mark in the tool options in the "" automatically select the layer, so that in addition to the slice tool, the path component selection tool, the pen tool and start tool, the other tools in the Toolbox to the currently selected, press and hold the CTRL key, the current tool will temporarily become mobile tool, click on any of the objects on the canvas, Photoshop will automatically go to the layer so that you can perform an operation.

这时，你可以先选择移动工具，在工具选项中勾选"自动选择图层"，这样，除了切片工具、路径组件选择工具、钢笔工具和抓手工具外，工具箱中的其它工具为当前所选时，按住Ctrl键的同时，当前工具都会暂时变成移动工具，点击画布上的任意对象，Photoshop都会自动转到其所在图层，这样就可以进行操作了。

During playing, press Five Directions Key to pause playing and press Five Directions Key again to continue playing; press "RETURN" to stop playing and display the play list.

按五个方向选择键选择要播放的文件或活页夹，然后选择要播放的文件或是活页夹，按OK键可进入播放模式，在播放过程中，按OK键可进入暂停，再按一次进入播放状态，按返回键将停止播放并进入播放清单中。

The user insets the money into the slit, and then the coin recognizer identify the inserted money and add it up; then the MCU sends out the signals about sellable goods by lighting the pilot lamp, so that the user can choose what he or she wants to buy; following the user presses the key related the goods which he or she wants to buy, and then the key makes single chip to start relevant parts to push out the goods, and now the buyer can get the goods. If there still left enough money, the user can buy another goods.

用户将货币投入投币口，货币识别器对所投货币进行识别；控制器根据金额将商品可售卖信息通过选货按键指示灯提供给用户，由用户自主选择欲购买的商品；按下用户选择商品所对应的按键，控制器接收到按键所传递过来的信息，驱动相应部件，售出用户选择的商品到达取物口；如果还有足够的余额，则可继续购买。

The variation of positive selective pressures from initial positive selection to eventual purifying selection not only represents the adaptive evolution of S protein from animals to human, but also provides a good clue to investigate the interspecies transmission of other viruses.

从最初的阳性选择到最后的负选择，S蛋白经历了变化的自然选择压力。这种变化的选择压力不仅反映了SARS-CoV由动物向人类跨种传播的适应性进化过程，也为研究其他病毒的跨种传播机制提供重要线索。

Likewise from all those persons of praetorian rank in Rome or within twenty miles of the city he shall select three. Likewise he shall select two from the rest of the senatorial order or from all those persons who have the right to vote in the Senate, who may be in Rome at that time or within twenty miles of the city.

中选择4人；同样的，从身在罗马或其20英里之内的大法官级人物中选择3人；同样的，再从其余的身在罗马或其周围20英里内的元老等级成员或有权在元老院投票之人中选择2人。

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％。