世界轨道交通装备排名前两位的制造商——中国南车和中国北车宣告合并，合并后的新公司将以“中国中车股份有限公司”的身份，参与世界高铁市场竞争。南北车合并（  ）

①公司全部资本将划分为等额股份 ②股东将按照出资比例行使表决权 ③旨在强化风险意识，改善经营管理 ④旨在实现优势互补，提高竞争力

【实验一】用如图所示装置，收集一试管甲烷和氯气的混合气体，照后观察到量筒内形成一段水柱，认为有氯化氢生成。

    David is from America. He and his family____(have) different plans for the coming holiday. David likes China very much and he____ (go) to Beijing last year. But he wants to know more about Chinese culture so he____ (visit) Beijing again. This time he is going to the Palace Museum. There____ (be) many interesting things about Chinese culture there. He____ (want) to take lots of photos of the things in the Palace Museum. He____ (show) them to his friends. David's father ____ (read) many books about Japanese history three months ago. He thought some things in Japan were interesting. He____ (take) a trip to Japan. David's mother didn't know where to go at first. At last she ____ (decide) to go to Singapore. She likes the climate (气候) there. What about David's sister? She ____ (stay) at home and do her homework.