A:用铁片和稀硫酸反应制取氢气时,改用9.8%的浓硫酸可以加快产生氢气的速率
B:10.0 mL 2 molL ﹣1的盐酸跟锌片反应,加入适量的氯化钠溶液,反应速率不变
C:SO 2的催化氧化是一个放热的反应,所以升高温度,反应速率减慢
D:汽车尾气中的NO和CO可以缓慢反应生成N2和CO2,减小压强,反应速率减慢
在下列各句的每个空格内填上一个适当的、完整的单词,该词的首字母已给。Tom felt too sleepy to keep a____ in history class. I can't follow you. Can you e_____ it to me again?Mary is s____ to be a good learner. Everyone thinks so.Last month 10 persons were killed in the traffic a _____ .He never does anything at home. He isn't a h____ boy. He's a lazy boy.
读我国长江、黄河水系示意图(如图),回答下列问题.