Which statement best describes echo?（） ["Echo is the discernable leak-through of your own Rx path into your own Tx path. ","Echo is the discernable leak-through of the packets of your Rx path into your own Tx path. ","Echo is the nonaudible leak-through of the packets of your Rx path into your own Tx path. ","Echo is the audible leak-through of the packets from the transmit path into your own receive path. ","Echo is the nonaudible leak-through of the packets of your Tx path into your own Rx path."]
“三人连锁放炮制度”中三人指（）。 ["班长","放炮员","警戒人","瓦检员"]
服务是一种行为，人们在购买之前看不见、摸不着和嗅不到，因此，人们只能以搜寻信息、参考多方意见和自身经验来判断服务优劣，这反映了服务的（） ["无形性","异质性","同步性","易逝性"]
您要为公司Web开发人员使用的计算机部署Windows 7。所有Web开发人员用户帐户都在一个组织单元（OU）内。Internet Explorer会阻止多个托管在不同服务器上的内部Web应用程序的弹出窗口。您需要使用组策略确保Internet Explorer不会阻止内部Web应用程序的弹出窗口。您应该怎么做？（） ["将每个服务器添加到Intranet区域","将每个服务器添加到Trusted Sites区域","启用Internet Explorer的Compatibility View","将Internet Explorer的默认安全设置设定为Medium"]
产生“二恶英”的城镇垃圾处理方法是（）。 ["填埋法","堆肥法","焚烧法","沼气法"]
儿童期（6~12岁）心理发展的主要冲突是（）——（）。
