题目

看图，选择正确的序号。 A. Yes, I am. B. No. I'm not. C. Yes, he is. D. No, he isn't. E. Yes, she is. F. No, she isn't. （1） —Are youwriting a letter? — （2） —Is shedrawing a picture? — （3） —Is hetidying his room?— 答案：【1】B 【1】E 【1】D17．配制480mL 0.1mol•L-1 HCl溶液，所需的仪器有：量筒、烧杯、玻璃棒、胶头滴管，还需要的玻璃仪器有500ml容量瓶．