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【多选题】
以下哪些因素可以使DNA变性A.
增加溶液的浓度
B.
加热
C.
改变溶液的pH值
D.
有机溶剂
E.
冷藏
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】根据现行《火灾自动报警系统设计规范》，某高层综合楼地下室为三层，当地下二层发生火灾时，消防控制室应先接通（）的火灾应急广播
A.
地下二层
B.
地下一层、二层、三层
C.
地下一层、二层和首层
D.
地下一层、二层、三层和首层
【简答题】用特殊疑问词填空。 (what, who, where, why, which, when, how, how often , how many, how old ) 1. —_________ do you get to school in the morning? —At half past seven. 2. —_________ does Kangkang usually play vol...
【单选题】逻辑 “与”算符是用来组配
A.
不同检索概念，用于扩大检索范围
B.
相近检索概念，扩大检索范围
C.
不同检索概念，用于缩小检索范围
D.
相近检索概念，缩小检索范围
【简答题】选用正确的疑问词完称问句。 how many, how much, how long, how soon, how often 1. — ____ do you usually have an art lesson? — Twice a week. 2. — ____ will Tree Planting Day be? — In a week. 3. — ____ CDs have you go...
【单选题】(Although) the danger that he might (be injured), Smith (bravely entered) the burning house (in order) to save the boy.
A.
Although
B.
be injured
C.
bravely entered
D.
in order
【简答题】Text 2 Although one might not think so from some of the criticism of it, advertising is essential to the kind of society in which people in the United Kingdom, and a very considerable proportion of th...
【单选题】Although one might not think so from some of the criticism of it, advertising is essential to the kind of society in which people in the United Kingdom, and a very considerable proportion of the world...
A.
every potential consumer in the world
B.
large countries in the world
C.
people with a high standard of living
D.
a large number of people in the world
【单选题】根据下列文章,请回答 26～30 题。 Text 2 Although one might not think so from some of the criticism of it, advertising is essential to the kind of society in which people in the United Kingdom, and a very considera...
A.
every potential consumer in the world
B.
large countries in the world
C.
people with a high standard of living
D.
a large number of people in the world
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