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【判断题】
蜗杆蜗轮常用于传递两轴交错60°的传动。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】建构主义对学习的解释主要有哪几点 ?
【单选题】设F(x)是连续型随机变量ξ的分布函数，x 1 ，x 2 为数轴上任意两点，且有x 1 ＜x 2 ，则( )不一定成立．
A.
F(x 1 ) 2)
B.
F(x 1 )≤F(x 2 )
C.
F(x)在x 1 处连续
D.
F(x 2 )-F(x 1 )=P(x 1 ＜x≤x 2 )
【简答题】设随机变量X的概率密度为f(x)，已知f(-x)=f(x)，（x>0）,而F(x)为X的分布函数．则有P{|X|＞a}= (a) 2[1-F(a)] (b) 2F(a)-1 (c) 1-F(a) (d) 1-2F(a)
【简答题】Match the words with the definition. Find the words in the article to read them in context. The paragraph numbers will help you. A __________ is a change from one thing to the next, either in action o...
【简答题】II. Find the words or phrases that fit the meaning in italics. To design a new bridge, a statistical study is made of the amount of traffic the bridge will expect to carry (par.2)
【简答题】Match the words with the definition. Find the words in the article to read them in context. The paragraph numbers will help you. A __________ is a change from one thing to the next, either in action o...
【简答题】可以引起代谢性酸中毒的原因有
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