问题
填空题
用所给动词的适当形式填空。
1. Li Ming _________ (live) in China.
2. _________ (be) these your suitcases?
3. I need to _________ (pack) my suitcase.
4. I _________ (not like) those pants.
5. They _________ (leave) for Beijing on the train.
答案
1. lives 2. Are 3. pack 4. don't like 5. leave
E2Pb(s) +2H+。则脱铅的最合适pH 范围为___（填代号）。