简述流感的预防措施。
下列保险中属于商业保险的是（）。 ["互助保险","储蓄性保险","相互保险","社会保险"]
Which two of these correctly describe Fibre Channel? （） [" supports multiple protocols"," works only in a shared or loop environment"," allows addressing for up to 4 million nodes"," allows addressing for up to 8 million nodes"," provides a high speed transport for SCSI payloads"," may stretch to a distance of up to100 km before needing extender"]
科学上规定光在1年内走过的距离称为（）。
以下属于“十不吊”内容的（）。 ["指挥信号不明不吊","超载不吊","工作场地光线刺眼不吊","恶劣天气不吊","重量不明构件不吊"]
按姚鼐的分类，下列文章各属于哪一类？荆轲赞
