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【判断题】
高效液相色谱中的流动相常用的是甲醇和水,溶剂甲醇为色谱纯,若为分析纯则要进行去除杂质等操作后再使用; 甲醇和水溶液作为流动相若因溶解有空气形成气泡还要进行处理。A.
正确
B.
错误
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举一反三
【简答题】A. any B. some C. anything D. something
【单选题】-Is there any milk in the fridge? -Sorry, there’s left in it.
A.
nothing
B.
none
C.
anything
D.
something
【判断题】生物制品(biological product)是应用普通的或以基因工程、细胞工程、蛋白质工程、发酵工程等生物技术获得的微生物、细胞及各种动物和人源的组织和液体等生物材料制备,用于人类疾病预防、治疗和诊断的药品。
A.
正确
B.
错误
【简答题】选词填空 either, his, each, it, something, another, any, himself, both, all, that 1. He _____ is very careless. He always makes such mistakes. 2. —This sweater is much too large for me. Could you show me_...
【简答题】Choose and fill in the blanks .选词填空。 1. Do you have (some, any) melon ? 2. What does your mother usually eat (for, of) breakfast ? 3. Jenny (eat, ate) breakfast six times last week. 4. The ball is lig...
【简答题】联系上下文,用 a,an, some, any , 选词填空。 ——Are there ______ cars in front of the building? —— No.
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