§7.4 离散系统的零输入响应 §7.5 离散系统的零状态响应

Unit 14 Flexible trade Letter 1 Take up:从事 Undertake:承担,保证 The down payment for the production line can not be higher than 10%of the total value; Repayment:偿还的款项

Unit 8 payment Points for attention: Letters regarding payment often fall into the following types: discussing mode of payment, urging establishment of L/C, amending L/ or asking for extension of L/C

Unit 12 Claim and Settlement Points for attention: When making a claim, plan your letter as follows: Begin by regretting the need to complain Mention the date of the order, the date of delivery and the goods complained about

Unit 11 Insurance Letter 1 1. We wish to refer you to our Order No. 123 for 1000 sets of TCL Colour Television, from which you will see that this order is placed on a CFR basis

一 心理障碍的概述 二 心理障碍的分类 三 神经症 四 人格障碍 五 性变态

Unit 10 Shipping Points for attention: Letters regarding shipment are usually written for the following purposes: To urge an early shipment; To amend shipping terms; ·To give shipping advice; To despatch shipping documents

§7.1 离散时间信号的描述 §7.2 抽样定理 §7.3 离散时间系统的描述和模拟

§6.5 波 特 图 §6.6/7 系统稳定性的判别

§3-4 周期信号的频谱 §3-5 非周期信号的频谱：傅立叶变换