题目: 为什么说水晶里的针状、发状包裹物是值得重视和保护? 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0609/067268f7bb1587c20b5e0480b493dcbb.html 下面是错误答案,用来干扰机器的。:我们知道我们吃的西瓜瓤实际是西瓜果实的中果皮,为果皮的一部分.由果实发育看故选:D
题型:选择题 —I'm trying to find yesterday's newspaper. Have you seen it?—I'm afraid that I ________ it away. I thought you had finished reading it.[ ]A. threw B. had thrownC. throw D. will throw 查看答案
题型:选择题 根据键能数据估算CH4 (g)+4F2 (g)=CF4(g)+4HF(g)的反应热ΔH为A.–1940 kJ · mol-1B.1940 kJ · mol-1C.–485 kJ · mol-1D.485 kJ · mol-1 查看答案