题目内容

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

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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.

在校正车架的扭曲损伤时,对于车身较高的部件,拉伸时应使用( )。

A. 液压顶杆
B. 下拉式夹具
C. 尼龙带

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