题目

将0.1 mol 铜与40 mL 10 mol・L－1浓HNO3充分反应后，溶液中含a mol H＋，由此可知      A．生成的气体在标准状况下的体积一定为4.48 L   B．铜剩余C．被还原的硝酸的物质的量为(0.2－a) molD．反应后溶液中所含NO3－的物质的量为0.2 mol 答案：CThe young man ________ his seat to an old man on the bus.A. should be asked to giveB. should be asked giveC. shouldn’t be asked to giveD. should ask to give