查询词典 object variable

Attempting to set the default printer to an object variable has no effect.

想为一个变量对象设置默认的打印机结果没成功。

You can assign either a reference type or a value type to a variable of the Object data type.

你可以将引用类型或值类型指派给 Object 数据类型的变量。

Declare object variable first in a code behind file.

声明对象变量在代码隐藏文件第一。

Xdoc is the object variable name of the type XMLDocument which will contain my XML data.

Xdoc是对象的类型XmlDocument的变量名，其中将载我的XML数据。

However, if you assign a value type to an Object variable, it behaves as if it holds its own data.

然而，如果将值类型指派给 Object 变量，则 Object 变量将表现得像存储自己的数据一样。

An Object variable always holds a pointer to the data, never the data itself.

Object 变量总是存储指向数据的指针，从不存储数据本身。

An object generator may be more useful than a plainconstructor when the exact type to be generated is difficult or impossibleto express and the result of the generator can be passed directly to afunction rather than stored in a variable.

当要产生的确切类型很难或者是完全不可能表达而generator的结构可以直接传递给一个函数而不是存储于一个变量中的时候，一个object generator可能比一个普通的构造函数更有用。

The invention relates to a dynamic matrix control system of high-purity distillation, which comprises distillation tower, intelligent checker, DCS system, superior host, and on-site bus, while they are connected. The control system uses tower product group as the object variable, and the reflux ratio and reboil ratio as control variable; the superior receives history temperature and pressure data from the DCS real-time database, via the predict control and dynamic matrix controller, to obtain the output values of present controller as reflux ratio and reboil ratio, then feedback said two values to DCS system, to function the distillation object. The invention can confirm the high-purity stable operation, with better dynamical control.

本发明公开了一种高纯精馏的动态矩阵控制系统和方法；系统包括：精馏塔、智能检测仪表、DCS系统、上位机和现场总线；所述精馏塔、智能检测仪表、DCS系统和上位机通过现场总线依次相连，实现信息流的上传和下达；本发明所涉及的控制系统采用塔双端产品组分为被控变量，回流比和再沸比为对应的控制变量；上位机从DCS实时数据库中获得历史的温度、压力等数据，通过推断控制环节和动态矩阵控制器环节，得到当前控制器的输出值-回流比和再沸比，再把控制器输出值返回给DCS系统，实现了对高纯精馏过程的双端产品高纯控制，对双端组分的高纯度平稳操作，具有很好的动态品质和控制效果。

When the instance is in the client side object cache, it appears to the programmer as a C or C++ structure or as a PL/SQL object variable.

当对象实例被放入客户端的对象缓存后，开发者可以将其作为 C/C++数据结构或 PL/SQL 变量使用。

However, it can only implement the limited operation to the spatial objects, cannot carry on transformation, index, interlink age and excavation to the spatial data, and hard integrate other information with combining map variable to set up and analysis new variable. Meanwhile, relational model in the traditional DBMS and the object- oriented modeling do not completely suit the spatial application domain. The relational model can handle topological relation well, but shows inabilities to that complicated level crossing the spatial region. Object-oriented model using software method based on the principle of the customer defined data type supports the abstract data type, especially spatial abstract data type, and possesses polymorphism and inheritances, and it can deal with topological and the layer relation, but hardly processes important continuous phenomenon in space.

GIS是当今操作有关空间信息的成熟工具和技术，但其只能对空间对象进行有限的操作，不能对空间数据进行变换、索引、链接和挖掘，难以集成其他信息来构建和分析新变量；而传统数据库管理模型中的关系模型和面向对象建模也不完全适合空间应用这一领域，关系模型能够较好地处理拓扑关系，但对表示横跨空间区域的复杂层次却无能为力；面向对象模型的软件方法支持抽象数据类型，特别是空间抽象数据类型，具有继承性和多态性，能够处理拓扑和层次关系，但难以处理空间中重要的连续性现象。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。