凯膜过滤器过滤压力太高的原因是什么？
参考答案：
1.进液量太大；
2.过滤器过滤能力降低。
根据句意及单词首字母完成单词。
1.“Who d____America?” the teacher asked.
2. He comes from an E____country,so he speaks English very well.
3. “I find it difficult to meet all the r____.”Jim said.
4. I want to know the r____for you being away from school.
5. It’s f____to learn another language.
按照外汇的支付方式,可将利率分为().
A.买入汇率
B.卖出汇率
C.电汇汇率
D.信汇汇率
E.票汇汇率
