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【简答题】
设二维随机变量(X，Y)的概率密度为 则P{X+Y≤1}=________．
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反馈参考答案：
举一反三
【简答题】— Is there a bank near here? — Yes, _____ . [ ] A . there is B. there are C. there isn't D. they are
【简答题】搞好玉米制种，在制种中应抓好哪几项措施？
【单选题】– Where is my shirt, mum? – ________.
A.
There is it
B.
There it is
C.
There is
D.
Here is it
【简答题】玉米制种播种有哪些要求？
【单选题】What does the woman mean?
A.
There is a market near here.
B.
There isn't a market near here.
C.
There is a market on the river.
【单选题】请判断下列句子类型: It’s still early, isn’t it? We have to get there at eight tomorrow, don’t we? Jim is never late for school, is he? There is no water here, is there?
A.
祈使句
B.
反义疑问句
【简答题】清热善治乳痈的要药是____，清热善治肺痈的要药是____。
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