题目内容： On 27th February 2008, something very unusual happened in the UK; there was a rather large earthquake. It was the biggest earthquake in 25 years in the UK. There have been very small tremors in the past ...

题目内容： (8分) 在我国，人民选举代表，组成各级国家权力机关，代表人民统一行使国家权力。但城乡人17选举人大代表的比例，经历了一个变化的过程。1953年制定...

题目内容： 能正确表示下列反应的离子方程式是 A．向Fe(NO3)2稀溶液中加入盐酸： 3Fe2＋＋4H＋＋NO3-===3Fe3＋＋NO↑＋2H2O B．铜片与浓HNO3： Cu＋NO3-＋4H＋===Cu2＋＋NO↑＋...