一、二次型的标准形式 二、二次型的规范型

§1 二次型的矩阵表示 §2 正交变换

11.1 概述 11.2 D/A转换器 11.3 A/D转换器

10.1 概述 10.2 施密特触发器 10.3 单稳态触发器 10.4 多谐振荡器 10.5 555定时器及其应用

7.1 概述 7.2 只读存储器( ROM ) 7.3 随机存储器( RAM ) 7.4 存储器容量的扩展 7.5 用存储器实现组合逻辑函数

3.1 概述 3.2 半导体二极管门电路 3.3 CMOS门电路 3.4 其它类型的MOS集成电路 3.5 TTL门电路

◆卷尺量距 ◆视距测量 ◆电磁波测距 ◆三角高程测量

Properties of Pressure Vertical to the surface and point into it. At any point, pressure is independent of orientation

When is a flow compressible? compressible flow differs from an incompressible one in that significant change happens in the density

Boundary layer(边界层) Although frictional effects in slightly viscous fluid are indeed present, they are confined to a thin layer near the surface of the body, and the rest of the flow can be considered inviscid. (1904, Prandt/)