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问题 选择题
可行域
x-y≥0
x+y≤6
y≥0
的面积是（　　）
A．3B．9C．18D．36
答案

解：画出不等式表示的区域为：

由直线x-y=0，x+y=6及y=0围成的三角形，

如图，其中A（6，0），B（3，3），O（0，0）．

故三角形OAB区域面积为：×OA×h= ×6×3=9．

故选B．

单项选择题

（）决定情绪的性质。

A.行为

B.认知

C.动机

D.需要
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单项选择题

UML-based tools are often used for J2EE/.NET application analysis and design, both because UML’s object orientation is ideal for the J2EE/.NET implementation (66) and because of the expanding scope and complexity of today’s enterprise endeavors. (67) the approaches diverge at the coding/implementation phase, a common set of analysis and design techniques applies to both J2EE and.NET.
The use of a virtual machine (VM) architecture is also common to J2EE and .NET. Application development tools (68) intermediate-level code instead of platform-specific binary code, which means the VM interprets that code in real time or performs Just-In-Time (JIT) compilation; the Microsoft VM always runs JIT-compiled code. This VM-based model results in (69) -independent applications and is conducive to the late-binding technique that’s (70) to the OO approach.

A．platform

B．framework

C．operation

D．computer
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