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【单选题】
食物中毒的潜伏期短,一般为_______。)A.
24小时
B.
36小时
C.
48小时
D.
72小时
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反馈参考答案：
举一反三
【简答题】刺激要能引起反应,要具备的条件是 __________ 、 ____________ 和 __________ 。
【简答题】（单元三 项目二）简述单循环指的四步动作。
【单选题】有一混合蛋白质溶液,各种蛋白质的 PI 分别是 4.3,5.0,5.4,6.5,7.4 ,电泳时欲使其都泳向正极,缓冲溶液的 pH 应该是
A.
pH4.1
B.
pH8.1
C.
pH 5.2
D.
pH 7.4
【单选题】有一混合蛋白质溶液，各种蛋白质的PI值分别为：4.6、5.0、5.3、6.7、7.3，电泳时欲使其中四种蛋白质泳向正极，缓冲液的PH应为（ ）
A.
4.0
B.
5.0
C.
6.0
D.
7.0
E.
8.0
【单选题】6) In this digital world, if we want to go to a restaurant we’ve never been to, we will probably ________.
A.
go to the restaurant directly
B.
check other people’s reviews of the restaurant on our smartphones
C.
call the manager of the restaurant before we make a decision
D.
ask friends about the details of the restaurant before making a decision
【简答题】Mr. Harris used to work in Dover, but then he changed his work, and he and his wife moved to another town. They did not have many friends there, but they soon met a lot of interesting people, and afte...
【简答题】We’ve been friends ( ) we
met at school.A. until B. ever since C. when D. every time
【单选题】有一混合蛋白质溶液,各种蛋白质的PI分别为4.6,5.0,5.3,6.7,7.3,电泳时欲使其中四种蛋白质泳向正极,缓冲液的pH应该是多少
A.
4.0
B.
5.0
C.
6.0
D.
7.0
E.
8.0
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