题目内容

2.1.4 Which of the following might contribute to classroom noise ?

A. Cooling system in the classroom.
B. Current teaching methods.
C. Organization of desks in the classroom.
D. Poor classroom acoustics.
E. There is no noise in the classroom.

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2.1.4 Can hearing impairment (障碍)affect one’s verbal communication?

A. No, there are no connections between them.
B. Yes, auditory function deficit can affect one’s development of speech.
C. It’s hard to say.

观察某呼叫台一个昼夜接到的呼叫次数,设事件A表示“一个昼夜接到的呼叫次数小于2次”,则样本空间Ω=__________,事件A=__________(请写集合)

对目标进行射击,击中后便停止射击,观察射击的次数,事件A表示“射击次数不超过3次”,则样本空间Ω=__________,事件A=__________

现有编号分别为1,2,3的三个不同的政治基本题,另有编号分别为4、5的两个不同的历史基本题.甲同学从这五个基本题中一次随即抽取两道题,用符号(x,y)表示事件“抽到的两题的编号分别为x、y,且x<y共有__________个基本事件。(填写数字)

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