下列有关说法正确的是（ ） A．铁锈的主要成分是Fe3O4 B．为防止铁制品锈蚀，用洗涤剂将其表面的油膜洗净 C．不锈钢属于铁合金 D．钢的含碳量高于
有学者指出：“一部中国近代史，便是一部中国文明转型史，而这个转型运动是有其明显的‘阶段性’的。‘甲午战争’便是一极重要的阶段——它标
Peter: What are you doing for vacation, Steven?Steven: I’m visiting my aunt in San Francisco. My brother’s staying there. He’s joining a club.Peter: Oh? When are you going?Steven: Ne
短文填空。Do you know Sweden？It l (1)in the north of Europe. It is the fourth largest country in Europe with an area of 450,000 square kilometers and a p (2) of about 8.5 million. Over one thir
吸毒严重危害人体健康与社会安宁，是世界的一大公害。摇头丸是国家严禁的一种毒品，化学式为C9H13N，它由_________种元素组成，每个分子有_____个原子
We’ll go for a walk if it _________ tomorrow. A. will not rain B. isn’t raining C. doesn’t rain D. rains
I came in tired and happy and badly in need_____ a bath. However, my elder brother insisted there wasn’t much need______ one A. of; for B. for; of C. for; for D. of; of
