流行性腮腺炎的传染期是 ["A．腮腺开始肿大至消退","B．腮腺肿大前7日至肿大后7日","C．腮腺开始肿大至肿大后7日","D．腮腺肿大前9日至肿大后7日","E．腮腺肿大前7日至肿大后9日"]
流行性腮腺炎的传播途径为 ["A．粪-口途径","B．飞沫传播","C．生活密切接触传播","D．血液传播","E．虫媒传播"]
传染性非典型肺炎的报告时限 ["A．12小时","B．6小时","C．24小时","D．2小时","E．4小时"]
流感的潜伏期为 ["A．3～5天","B．1～3天","C．5～7天","D．数小时","E．12～24小时"]
根据推广使NNNN标准，运输标志由（）组成。 ["收货人简称","目的地","合同号","件号"]
时间戳有哪几部分内容？图示并说明时间戳的产生过程
