题目内容

下列氨基酸属于亚氨基酸的是

A. 谷氨酸
B. 脯氨酸
C. 赖氨酸
D. 苏氨酸

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含有苯环的氨基酸是

A. 苯丙氨酸
B. 天冬酰胺
C. 蛋氨酸
D. 酪氨酸

设随机变量X服从(1, 5)上的均匀分布，这里的均匀性或等可能性指的是X的所有可能取到的值为1，2，3，4，5，且X取到每个值的概率相等，都等于1/5. （）

A. 对
B. 错

设X服从指数分布，则一定有P(X>3|X>1)=P(X>4|X>2)成立。（）

A. 对
B. 错

Directions: Listen to Recording 2.2, and complete the following extracts.Nature’s Way Foods is a food- 1 company based on the south 2 of England. We put 3 product, the majority of which is 4 and fruit, into various types of 5 for the major retailers and various food-service companies in the UK. Examples of retailers would be Tesco’s, Morrison’s and Waitrose, and 6 food-service companies, our biggest 7 is McDonald’s, which I’m sure most of you will be 8 with.