【简答题】根据句意、首字母和汉语意思完成单词。 1. When you a______ in Beijing, please call me. 2. Your mother is w______ for you at the school gate. 3. When you visit someone, please k______ at the door. 4. I often help my mothe...
【简答题】填空题。 据句意及所给单词首字母或汉语意思完成下列句子。 1. Coming top in such an important exam is quite an a_____. 2. The ship is in no c_____ to make a long voyage. 3. Their b_____ towards me shows tha t they do not like me. ...
【简答题】根据汉语意思或首字母提示,填写适当的单词。 1. The weather during our holiday was p________. 2. After a time, you get to ________ (认识到) the importance of English study. 3. It's i________ for man to go to the sun. 4. We use...
【简答题】根据汉语意思或首字母提示.用适当的词补全句子. 1. Although it was expensive, we _____ (决定) to buy it. 2. Who _____ (发现) America first? 3. I like eating _____ (脆的) cookies. They are hard,dry and easily broken. 4. I met her b...
【单选题】设随机变量X 1 , X 2 是任意两个独立的连续型随机变量,它们的概率密度分别为f 1 (x)和f 2 (x),分布函数分别为F 1 (x)和F 2 (x),则( )
A.
f 1 (x) +f 2 (x) 必为某一随机变量的概率密度
B.
f 1 (x) f 2 (x) 必为某一随机变量的概率密度
C.
F 1 (x)+F 2 (x) 必为某一随机变量的分布函数
D.
F 1 (x)F 2 (x) 必为某一随机变量的分布函数
【简答题】单词拼写:(每小题1分,共10小题,满分10分) 据句意及所给单词首字母或汉语意思完成下列句子。 1. In China Tomb-sweeping Day(清明节) is a day to be in memory of their a____________. 2. Many r____________ people believe the souls of good people will ...
【简答题】根据首字母或汉语意思写单词。 1. F________ is very important for students. 2. Some friends have opposite views and________(兴趣). 3. I called the police station to get some________(信息)about my lost dog. 4. I don't___...
【简答题】根据汉语意思和首字母提示补全单词。 1. In s__________, I like to swim in the river. 2. How many s__________ are there in a year? Four. 3. This is my favourite __________ (电台). 4. It is __________ (温暖多雨的) in spring. 5....
【判断题】设 F(x) 为随机变量 X 的分布函数 , 则它是一个单调不降的函数。
【判断题】设F(x)为随机变量X的分布函数,则它是一个单调不降的函数.