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问题 填空题

直线l1x+2y-4=0与l2：mx+（2-m）y-1=0平行，则实数m=______．

答案

因为直线l1x+2y-4=0与l2：mx+（2-m）y-1=0平行，

所以1×（2-m）-2m=0，解得m=

2
3

故答案为：

2
3

单项选择题

当铲运机铲土接近设计标高时，为了正确控制标高，宜沿平整场地区域每隔( )m左右，配合水平仪抄平，先铲出一条标准槽，以此为准，使整个区域平整达到设计要求。

A．5
B．10
C．20
D．30
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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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