1.试题呈现.某地拟召开一场安全级别较高的会议,预估将有4000至7000名人员参加会议,为了确保会议的安全,会议组委会决定对每位入场人员进行安全检查.现了解到安检设备有门式安检仪和手持安检仪两种:门式安检仪每台3000元,需安检员2名,每分钟可通过10人:手持安检仪每只500元,需安检员1名,每分钟可通过2人.该会议中心共有6个不同的入口,每个入口 1. Questions presented. A proposed high-level conference to a higher level of security is expected to have 4,000 to 7,000 people attended the meeting, in order to ensure the safety of the meeting, the meeting organizing committee decided to conduct a security inspection for each admission It is understood that there are two types of security devices such as gantry security guards and handheld security guards: 3,000 security guards for each type of security guards, 2 security guards are required, and 10 people can pass each minute: 500 Yuan for security guards 1 member, 2 people per minute. The conference center has a total of 6 different entrances, each entrance