用vc6.0开发的认识管理系统。需求及功能如下： 某小型公司，主要有五类人员：总经理（TotalManager）、销售经理（SalesManager）、技术经理（TechManager）、技术员（Technician）、销售员（Salesman）。 有两个部门：销售部（SalesDept）、技术部（TechDept），每个部门可以有0或1个经理，部门经理管理该部门员工，总经理管理所有部门。 ① 显示人员信息，人员信息包括：姓名（Name）、编号（No，从1000号开始递增）、级别（Grade）
Chapter 1 Introduction to Amateur Radio 1 Who Can Become a Ham Radio Operator? 1 New Avenues into Amateur Radio 2 About Amateur Radio 2 A History of Amateur Radio 3 Early pioneers 3 Beginning of amateur radio 5 First licenses for amateur radio opera
A hands-on guide to finding the sources of electromagnetic interference and then fixing the problems. Includes basic theory of EMI as well as detailed explanations of why this problem is becoming more serious as the international scope of the commun
Practical Radio Frequency Test and Measurement will teach readers the basics of performing the tests and measurements used in radio-frequency systems installation, proof of performance, maintenance, and troubleshooting. Practical Radio Frequency Tes
