以下可能携带病毒或木马的是()
A.二维码
B.IP地址
C.微信用户名
D.微信群
参考答案:A
— Has your brother returned from the USA yet?
— Yes, but he ____ here for only two days before his company sent him to Australia. [ ]
A. stayed
B. has stayed
C. will stay
D. was staying
为了与供应商建立互惠关系,稳定供需关系,在采购中可根据环境变化,对采购规格、数量及价格做灵活的调整,这种采购方式是()。
A.招标采购
B.订价采购
C.询价采购
D.议价采购