稳定塔设有()个进料口,可根据进料温度和季节选择不同的进料口操作。
参考答案:3
句型转换。
1. The designer designed the casual clothes. (改为被动语态)
________________________________________
2. The bus is very big, it can hold ten people. (同义句)
The bus is ______ ______ to hold ten people.
3. They worked in the hospital for 9 hours yesterday. (对划线部分提问)
______ ______did they work in the hospital yesterday?
4. The show will start at 10:30 tomorrow morning. She said. (连成一个宾语从句)
She said ______ the show ______start at 10:30 tomorrow morning.
5. We will meet at our school gate at 8:00 tomorrow. (对划线部分提问)
______ and ______shall we meet?
用NA表示阿伏加德罗常数的值。下列叙述正确的是
A.100 mL pH=2的盐酸与醋酸溶液中氢离子数均为10-3NA
B.标准状况下,11.2 L C2H2和N2的混合气分子中σ键数目为0.5NA
C.常温常压下,4.6 g Na在O2中燃烧消耗O2的分子数为0.05NA
D.常温常压下,33.6 L氯气与27 g铝充分反应,转移电子数为3NA