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问题 单项选择题

“掷两个骰子得到点数之积”的样本空间中样本点的个数为( )。

A．6

B．18

C．24

D．36

答案

参考答案：B

解析： 每个骰子的可能点数为：1，2，3，4，5，6。故“掷两个骰子得到点数之积”的样本空间为：Ω={1，2，3，4，5，6，8，9，10，12，15，16，18，20，24，25，30， 36}，其样本点个数为18。

单项选择题

People are indulging in an illusion whenever they find themselves explaining at a cocktail(鸡尾酒 ) party, say, that they are "in computers," or " in telecommunications," or "in electronic funds transfer". The implication is that they are part of the high-tech world. Just between us, they usually aren’t. The researchers who made fundamental breakthroughs in those areas are in a high-tech business. The rest of us are (11) of their work. We use computers and other new technology components to develop our products or to organize our affairs. Because we go about this work in teams and projects and other tightly knit working group(紧密联系在一起的工作小组 ), we are mostly in the human communication business. Our successes stem from good human interactions by all participants in the effort, and our failures stem from poor human interactions.
The main reason we tend to focus on the (12) rather than the human side of work is not because it’s more (13) , but because it’s easier to do. Getting the new disk drive installed is positively trivial compared to figurine out why Horace is in a blue funk(恐惧)or why Susan is dissatisfied with the company aver only a few months. Human interactions are complicated and never very crisp(干脆的,干净利落的) and clean in their effects, but they matter more than any other aspect of the work.
If you find yourself concentrating on the (14) rather than the (15) , you’re like the vaudeville character(杂耍人物)who loses his Keys on a dark street and looks for them on the adjacent street because, as he explains, "The light is better there!\

A．technical

B．classical

C．social

D．societal
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单项选择题

三条及以上绝缘导线穿于同一管内时，其总截面不应超过管内截面的（）。

A．40％

B．50％

C．60％

D．70％
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