【简答题】句型转换。 1. It's necessary to study hard in the school.(同义句) ______ ______ study hard in the school. 2. We should watch TV too much.(否定句) We ______ ______ TV too much. 3. They went to the park yesterday ...
【简答题】【探究实验】用两根分别蘸有浓氨水(NH 3 ·H 2 O)和浓盐酸(HCl)的玻璃棒相互接近,产生大量的白烟。 【问题提出】白烟是什么物质形成的呢? 【查阅资料】浓氨水易挥发出NH 3 气体;浓盐酸易挥发出HCl气体;NH 3 与HCl可发生化合反应;铵盐遇碱放出氨气;氯化银为白色沉淀;氨气具刺激性气味并使湿润酚酞试纸变红 【猜测】(1)你的猜测是_________;理由是____________...
【单选题】It’s snowing so ________ that we can ________ go out now.
【判断题】成功者必是立即行动者,所以,我们只要勇往直前,敢于行动,就不会失败。( )
【单选题】某同学探究氨和铵盐的性质时,相关实验操作及现象描述正确的是:
C.
将分别蘸有浓氨水和浓硫酸的两根玻璃棒接近,观察到白烟产生
【判断题】下颌智齿冠周炎沿下颌支外侧面向后可形成咬肌间隙感染。
【简答题】用所给单词的适当形式填空 1. It's hard (stop) riding cars. 2. _ ___ ( recycle) paper is really hard. 3. The trees can stop the wind (move) towards the rich land. 4. I stopped (use) napkin last year. 5. She re...