问题
填空题
用所给代词的适当形式填空。
1. _____ is Chinese. (his)
2. This is Mark. _____book is here. (he)
3. That's Lisa. _____ pencil is old. (she)
4. _____ is my English teacher. (her)
5. Is that _____ backpack, Jones? (you)
答案
1. He 2. His 3. Her 4. She 5. your
2SO3(g)并达到平衡，在此过程中，甲维持容器的体积不变，乙维持容器的压强不变，若甲中SO2的转化率为a%，则对乙中SO2的转化率的合理描述为下列的 （ ）