【判断题】羧酸的衍生物主要是制备成固体酰胺或固体酯。
【单选题】中国古代有工宫制度,历史上著名的工官有:( )
【单选题】中国古代有工官制度,历史上著名的工官有:
【单选题】— Excuse mc, are you waiting for the bus? — Yes, I am. But the bus is so late.______, how can I get to No.1 Middle School?
【单选题】In my class, 75% students take the bus to school. So _______ students get to school by bus. [ ]
【单选题】中国古代有工官制度,历史上著名的工官有:
【单选题】There were too many people on the bus, so I couldn't get on. The bus was _______. [ ]