【简答题】I. 现有下列8种物质 ① ;② ;③ ;④HF;⑤ ;⑥ ;⑦食盐水;⑧ 其中属于强电解质的是_____________(填序号,下同),既能跟盐酸反应又能跟 溶液反应的是_____________。 II. 现有一瓶浓度为 的某酸溶液,可能为醋酸、盐酸、硫酸中的一种,为了确定该酸溶液的组成进行实验:取 该酸 溶液,逐滴加入 的氢氧化钠溶液,恰好反应完全时所需碱液体积为 ,请用化学用语回答: (...
【单选题】Shopping for clothes is not the same experience for a man as it is for a woman. A man goes shopping because he needs something. His purpose is settled and decided in advance. He knows what he wants, a...
A.
he buys cheap things, regardless of quality
B.
he chooses things that others recommend
C.
he does not mind how much he has to pay for the right things
D.
he buys good quality things, so long as they are not too dear
【判断题】农业经营规模是农业经营单位经营活动规模的数量反映,是普遍的数量表现。( )
【简答题】3. My phone, my hair dryer, and my microwave oven
all ____ (break) in the same week.