如图是初三某班同学探究铁生锈实验不断完善优化的过程.
(1)优化实验时将Ⅰ中自来水换为蒸馏水目的是____.
(2)优化实验时增加Ⅳ是为证明铁生锈与空气中的 ____ (填化学式)有关,
(3)实验Ⅴ在软塑料瓶中完成的,一周后可观察到铁钉生锈,____ ,同时铁钉靠近水边附近部分锈蚀得厉害.由此可知:铁生锈实际是铁与 ____ (填化学式)共同作用的结果.
(4)实验Ⅵ还可用来完成____ (填实验名称).
欧洲人酷爱乳产品和牛羊肉,其饮食结构与下列何种因素有着密切的关系
2005年的春晚有一大亮点,以对联的形式描绘我国各省区的突出亮点,例如,①苍松雪岭,沃野龙江稻谷香;②碧草毡房,春风马背牛羊壮;③琼海独具大手笔,五指擎天;④石林自有高材生,群峰拔地.以上四幅对联描写的是( )
Peter is thirteen years old. He is in Grade Two this year. He likes to play football and watch football matches. And he often reads newspapers. He does his best to know where and when there is going to be a football match. Now Peter is having lunch. He is listening to the radio, too. He is very happy because there is going to be a nice football match on TV at four this afternoon. He wants to watch it very much. But he is going to have English and Chinese lessons. He thinks hard and finds a way.“ Hello, Mrs. Black,” Peter says to his teacher on the telephone, “ Peter is ill in bed. He wants to ask for half a day’s leave ( 请半天假 ).”“ Oh, I’m sorry to hear that.” says Mrs. Black, “ But who’s that?”“ It’s my father, Mrs. Black.”
对如图所示枝条和枝芽结构的叙述,错误的是( )
根据有关资料,完成下列问题。
材料一:北京时间2013年9月10 中远集团永盛轮靠泊荷兰鹿特丹港,顺利完成北极东北航道首航任务。这是第一艘成功经由北极东北航道到达欧洲的中国商船。8月27日3时30分通过白令海峡到达北极东北航道的起始点,6时进入北极圈,然后向西经过楚科奇海、德朗海峡、东西伯利亚海、新西伯利亚群岛北部、拉普捷夫海、维利基斯基海峡、喀拉海、新地岛北部、巴伦支海,于9月5日抵达挪威北角附近,经过10天航行2936海里,顺利通过东北航道。此次永盛轮从太仓出发通过北极东北航道到达鹿特丹航程为7931海里,航行27天,比传统的经马六甲海峡、苏伊士运河的航线缩短航程2800多海里,全程耗费48天。
材料二:世界局部地区示意图: