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【简答题】
某企业有A、B两个投资项目,计划投资额均为1 000万元,其收益(净现值)的概率分布如下表: 金额单位:万元 市场状况 概率 A项目净现值 B项目净现值 好 0.2 200 300 一般 0.6 100 100 差 0.2 50 -50 要求: (1) 分别计算A、B两个项目净现值的期望值。 (2) 分别计算A、B两个项目期望值的标准差。 (3) 判断A、B两个投资项目的优劣。
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【简答题】按 之不同,钢材有镇静钢和沸腾钢之分。
【简答题】水准路线有哪些形式？各种路线形式的概念是什么？
【简答题】将下列句子中的汉语部分译成英语，注意所用词的形式。 小题1:What’s this ? ( 用英语) 小题2:— is he ? ( 几岁；多少岁 ) —He is four. 小题3:—What does your sister look like? —She has . (一张圆圆的脸) 小题4:—What does Han ...
【简答题】按( )的不同，钢材有镇静钢和沸腾钢之分。
【单选题】The main hypothesis on the origin of life on earth holds that ___.
A.
life arose spontaneously by chemical evolution
B.
life arose by physical evolution
C.
meteorites brought prokaryotic cells to earth
D.
life arose by natural selection
E.
none of the above
【简答题】Look and write.美图配好词，将下列的课程用英语表达出来。 _____
【单选题】The main hypothesis on the origin of life on earth holds that .
A.
life arose spontaneously by chemical evolution
B.
life arose by physical evolution
C.
meteorites brought prokaryotic cells to earth
D.
life arose by natural selection
【单选题】The main idea of the Sapir-Whorf Hypothesis is that
A.
language is just a device for reporting a person's experience.
B.
two languages can represent the same social reality.
C.
the social reality can be conveyed to a person who does not speak the language.
D.
language functions as a way of shaping a person's experience.
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