乙烯和乙醇的混合气体VL,完全燃烧后生成CO2和H2O,消耗相同状态下的氧气3VL,则混合气体中乙烯和乙醇的体积比是 [ ]
A.1:1
B.2:1
C.1:2
D.任意比
答案:D
词汇。根据句意及所给首字母完成下列句子。
1. You room is so dirty. Please c______it now.
2. Could you take a picture for us? Here is the c______.
3. There is a supermarket near my home. Let's go s______.
4. The family live in an a______on Renmin Road.
5. He often goes to the l______to borrow( 借) some books.
没有覆盖前牙唇面或后牙颊面的部分冠修复体为
A.嵌体B.半冠C.烤瓷熔附金属全冠D.桩冠E.3/4冠