In C# you can flag a value type as a nullable type by adding ? after the type (like int? x;).
在C#中，你可以在一个允许为空的值类型后面加上一个问号（比如，int?x;）。
A persistent closure of a managed root entity x is defined as the set of managed entities C(x) ={e}, where e is reachable from x directly or indirectly via a persistent relationship.
管理根实体x的一个持久化闭包被定义为一个管理实体集C(x) ={e}，其中 e 可以直接或间接通过一个持久化关系从 x访问。
If you do require interoperability with WebSphere application server V4.x clients or application servers, then you will need to configure the noted SAS port (c) to be static by assigning it a value.
如果您确实需要WebSphereApplicationServerv 4 . x客户机或者应用程序服务器具有互操作性，就需要给指定的SAS端口(c)分配一个值，将其配置为静态的。
So, just to get you used to this idea, I'm going to draw a level surface of a function of three variables OK, so it's a surface given by the equation w of x, y, z equals some constant c.
为了令你们习惯于这个想法，我画一个三变量函数的等值面,这是一个平面,由函数w=c给出的。
C or F value, the X and Y coordinates of the center of a pixel at the up-left corner of the image, can be measured according to characteristic point in topographic map.
值为栅格图像左上角像素中心在地图上的X，Y坐标，其值可以根据特征点在地形图中的坐标量测获得。
The developed theory is used to analyse the impedance-match problem of microstrip meander line ferrite phaser in X-Band, C-Band, and a good agreement with the experimental results is obtained.
用所得理论来分析X波段和C波段弯曲线型微带铁氧体移相器的阻抗匹配问题，与实验结果十分符合。
Conclusion: the implantation of upper-middle thoracic pedicle screw under the guidance of the C-shaped arm X-ray perspective is a simple and feasible method, and improve the accuracy and safety.
结论：C形臂x线透视下分步引导上中胸椎椎弓根螺钉植入，是一种能提高上中胸椎椎弓根螺钉植入的简单经济、确实可行的方法。
Conclusion: the implantation of upper-middle thoracic pedicle screw under the guidance of the C-shaped arm X-ray perspective is a simple and feasible method, and improve the accuracy and safety.
结论：C形臂x线透视下分步引导上中胸椎椎弓根螺钉植入，是一种能提高上中胸椎椎弓根螺钉植入的简单经济、确实可行的方法。
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