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【简答题】
某工厂计划生产一种新产品,产品的销售情况有畅销(θ1),滞销(θ2)两种,据以往的经验,估计两种情况发生的概率分布和利润如下表所示: 状态θ 畅销(θ1) 滞销(θ2) 概率P(θi) 0.8 0.2 利润(万元) 1.5 -0.5 为了进一步摸清市场对这种产品的需求情况,拟聘请某咨询公司进行市场调查和分析,该公司对销售情况预测也有畅销(H1)和滞销 (H2)两种,对畅销预测的准确率为0.95,对滞销预测的准确率为0.9: P(Hi/θj) θ1 θ2 H1 0.95 0.10 H2 0.05 0.90 (1)通过调查,该企业收益期望值能增加? (2)如何决策可以使利润期望值最大?
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【简答题】vt. attract sb. and make them like you, sometimes in order to make them do sth. for you 迷住;吸引n. [C, U] a special quality sb. or sth. has that makes people like them, feel attracted to them, or be easi...
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【单选题】You are going to read a newspaper article about a man who is running round the world. Eight paragraphs have been removed from the article. Choose from the paragraphs A-I the one which fits each gap (1...
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I did it for him. Even though he akeady holds the world long-distance running record, he still needs to continue proving he is keeping up a reasonable running speed.
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He has not yet sorted out a route and appears surprised when I tell him that there are no proper roads across it, as local people prefer to use the rivers instead.
C.
He's done this by selling his story to journalists. He is very aware that he is a marketable product.
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E.
Apart from the day in south Australia where it was 45℃ in the shade and he collapsed, Australia is, he says, perfect running country. This compares to his experiences in temperatures of—30℃ in parts of Asia.
F.
Next week he heads off north, towards the Amazon, hoping to run to New York. After that, he just has to take care of Africa and Antarctica.
G.
So he is a touchingly solitary figure. He is too mobile to be able to make many friends, although he did meet someone in Australia who cycled next to him for 600 kilometres.
H.
Fortunately, the cold and the rain don't seem to bother him. It is partly his strength of character that made him refuse to take health insurance.
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【判断题】射线只能对体细胞产生致畸作用,不能对生殖细胞产生致畸作用。
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【简答题】Today we can get round the world in ______ hours.
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【单选题】—It’s amazing that an Australian girl sailed round the world alone in about 200 days. —That’s an inspiring story. Her courage is really _______.
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【单选题】B News 1 Have you ever thought of being able to fly round the world in a few hours though it is about 40，000 kilometres? One day， maybe you can． Last Saturday， the American X-43A airplane made its fir...
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people can't go round the earth in a few hours
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【简答题】vt. attract sb. and make them like you, sometimes in order to make them do sth. for you 迷住;吸引n. [C, U] a special quality sb. or sth. has that makes people like them, feel attracted to them, or be easi...
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【判断题】射线只能对体细胞产生致畸作用,而不能对生殖细胞产生致畸作用。
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A.
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B.
He has not yet sorted out a route and appears surprised when I tell him that there are no proper roads across it, as local people prefer to use the rivers instead.
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So he is a touchingly solitary figure. He is too mobile to be able to make many friends, although he did meet someone in Australia who cycled next to him for 600 kilometres.
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Fortunately, the cold and the rain don't seem to bother him. It is partly his strength of character that made him refuse to take health insurance.
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【单选题】Dolly wants to cycle round the world and she is really keen the idea．
A.
on
B.
for
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【判断题】射线只能对体细胞产生致畸作用,不能对生殖细胞产生致畸作用。
A.
正确
B.
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查看完整题目与答案
【简答题】Today we can get round the world in ______ hours.
查看完整题目与答案
【单选题】—It’s amazing that an Australian girl sailed round the world alone in about 200 days. —That’s an inspiring story. Her courage is really _______.
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A.
经济人
B.
社会人
C.
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D.
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查看完整题目与答案
【单选题】B News 1 Have you ever thought of being able to fly round the world in a few hours though it is about 40，000 kilometres? One day， maybe you can． Last Saturday， the American X-43A airplane made its fir...
A.
people can't go round the earth in a few hours
B.
the American X-43A airplane traveled round the earth in a few hours
C.
the American X-43A airplane is the fastest one in the world
D.
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查看完整题目与答案