温度对活性下降的影响很大,随着使用时间堵塞延长,活性衰退,可以通过提高温度以弥补活性的衰退。但是可操作的温升裕度是有限的,一般有30~50℃,必须慎重升温。
参考答案:对
用所给词的适当形式填空。
1. Your father look very _________ . (health)
2. I think this book is the _________ (useful) of all.
3. He bought some Chinese _________ (paint) yesterday. He liked them very much.
4. Let's talk about English _________ (teach) in Japan.
5. Yesterday a _________ (foreign) came to our school.
我国锌冶炼工艺以()为主。