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PCB实际布线中的一些理论冲突问题
基本上, 将模/数地分割隔离是对的。 要注意的是信号走线尽量不要跨过有分割的地方(moat), 还有不要让电源和信号的回流电流路径(returning current path)变太大。 晶振是模拟的正反馈振荡电路, 要有稳定的振荡信号, 必须满足loop gain与phase的规范, 而这模拟信号的振荡规范很PAT-乙 1039 到底买不买 (20 分)
小红想买些珠子做一串自己喜欢的珠串。卖珠子的摊主有很多串五颜六色的珠串，但是不肯把任何一串拆散了卖。于是小红要你帮忙判断一下，某串珠子里是否包含了全部自己想要的珠子？如果是，那么告诉她有多少多余的珠子；如果不是，那么告诉她缺了多少珠子。 为方便起见，我们用[0-9]、[a-z]POJ-2409 Let it Bead 【置换群-Polya定理】
Let it Bead Time Limit: 1000MS Memory Limit: 65536K Description "Let it Bead" company is located upstairs at 700 Cannery Row in Monterey, CA. As you can deduce from the company name, their business is beads. Their PR department found oFloyd传递背包
Median Weight Bead Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 4170 Accepted: 2159 Description There are N beads which of the same shape and size, but with different weights. N is an odd number and the beads are labeled as 1, 2, .