【单选题】--- He’s already been back to Australia, _____ he? ---_______________. He is on a visit to Shanghai.
【单选题】亚铁氰化铜的稳定剂是亚铁氰化钾,则该胶团的胶粒所带电荷的符号是
【多选题】陈某(15周岁)因喜好计算机,于某日深夜潜入公司内盗窃价值3万余元的计算机原器件(事发后均被追回)。对陈某应当如何处理( )
【单选题】- What's happened to Tom? –()to hospital.
【单选题】--Where is Mr.Green?--______the library.