广告的本质是（） ["宣传","传播","促销","说服"]
Cisco provides two enhancements to 802.11 security which protect a WEP key from exploits. Which two technologies provide these security enhancements？ （） ["802.1X","Cisco Temporal Key Integrity Protocol （CKIP）","Extensible Authentication Protocol-Flexible Authentication via Secure Tunneling （EAP-FAST）","Cisco Message Integrity Check （CMIC）","One-Time Passwords （OTP）","Advanced Encryption Standard （AES）"]
下列关于自然灾害的启动机制说法不正确的是（） ["诱发因素是指由于这种因素的触动作用而瞬间进入灾变状态","自然因素主要是指风暴潮、暴雨、火山、地震等","随着科技的发展，人类对自然因素已有一定的控制能力","人为因素占的比例越来越多，如工程建设、资源开发等"]
红色尖晶石的吸收光谱是（） ["Fe谱","Cr谱","Mn谱","Co谱"]
第二产业
旅行社的经营范围如何划分？
