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【简答题】
III. Rewrite the following sentences, using can, could, may or might . 1. He is in poor health. It is possible for him to fall ill at any time. 2. John looks pale today. It is possible that he is ill. 3. Even experts are possible to make mistakes. 4. John was able to swim when he was five. 5. Visitors were allowed to take photos of the castle. 6. Am I allowed to borrow your phone? 7. Nobody knows where he is. Maybe he is in the library, or maybe he is in the lab. 8. It is possible that John has read the book on WWII. 9. I looked everywhere but I failed to find my dictionary. 10. Kens car had been stolen, so it was impossible for him to give her a ride.
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举一反三
【多选题】PVC 热降解影响因素描述正确的是 ( )。
A.
高分子链有很多薄弱环节
B.
最主要的薄弱环节是双键
C.
树脂聚合度越低降解速度 ( 即热分解速度 ) 越快
D.
温度越高，受热时间越长，降解速度也越快
【简答题】阅读理解。 People often have the impression that Chinese characters are extremely difficult to learn. In fact, if you were to try to learn how to write Chinese characters, you would find that they are not ...
【简答题】影响热解的主要因素
【简答题】影响热解的主要因素有哪些？
【简答题】根据化学反应的基本原理,解释影响木材热解的主要影响因素。
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