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【简答题】
从5双不同的鞋子中4只,求取得的4只鞋子中至少有2只配成一双的概率.(请用多种方法求解.)
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举一反三
【简答题】Drums in Space Brenda Bongos was a girl with one big ambition — to play the drums in a band. But one big problem lay in her way. To be good enough to play in a band, Brenda had to practice a lot, but ...
【单选题】安全电压即为人触及不能引起生命危险的电压,我国规定在高度危险的建筑物是()。
A.
12伏;
B.
36伏;
C.
72伏;
D.
110伏。
【单选题】—条指向正北方向直线的方位角和象限角分别为()度。
A.
90、 90
B.
180、 0
C.
C 0、0
D.
270、90
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【单选题】Directions: Choose the one that best completes the sentence, or fully expresses the meaning of the given word. She had lived to be very old and at last infirm. ( )
A.
invalid
B.
determined
C.
unsteady
D.
feeble
【简答题】在食性、栖息地或活动时间等生态位相似或相同的两种生物不能在同一地方永久共存;如果它们能够在同一地方生活,它们肯定在食性、栖息地或活动时间等某些方面有所不同,这称为 ( )假说 ,也称为 ( )原理。
【简答题】Mother Wolf was magnificent animal. She had all the traits of a terrific hunter. She was very strong and fast. She knew how to hide and how to seize prey. Mother Wolf was the forest's supreme creature...
【简答题】When Mrs. Joseph Groeger died recently in Vienna, Austria, people asked the obvious, “Why did she live to be 107?” Answers were provided by a survey conducted among 148 Viennese men and women who had ...
【简答题】放样增料与除料需要两个( ),( ) ,( )的草图。
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