【单选题】在制作动画时,用下列哪一项来设置起始位置和终止位置?
【简答题】请各举出一个实例,说明下列说法是错误的. (1)所有原子的原子核中都含有中子. 实例:(1)______. (2)凡均一、稳定的液体都是溶液.(2)______ (3)一切物质都是由分子构成的. (3)______. (4)有单质生成的反应一定是置换反应. (4)______.
【简答题】阅读理解。 Americans are very direct people. When they want something they say “yes” and when they don’t they say “no”. If they want something different from what is given, they ask for it. Here’s an examp...