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(2015•济南)小球在如图所示的地板上自由滚动,并随机地停留在某块方砖上,每一块方砖除颜色外完全相同,它最终停留在黑色方砖上的概率是____ .

上一题 下一题 0.0难度 选择题 更新时间:2020-02-12 11:31:59

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4
9

同类题1

阅读理解

C

    Kevin and his family had a holiday to his hometown—a very beautiful island. It was a great trip.

    They all wanted this trip. Kevin's parents wanted to go out into nature after a long time of work. Kevin needed to take a good rest before the exam. Kevin's brother Jim is in the first grade, so he doesn't have a voice in family things. He was just happy that they were going outside.

    The sea was blue. They went boating in the sea. It was so cool. There was no Internet, so they spent the whole time together. They stayed in a small wooden house by the sea. Mom and Kevin cooked delicious sea food. Jim ran after chickens and ducks, and gave them food. When he became tired, he sat next to his dad and helped him fish. He even helped to hook two fish!

    It is always good to spend time with families. They liked this trip!     

同类题2

世界的真正统一性在于它的物质性。

同类题3

填上“>”、“<”或“=”

1米____1厘米

45厘米____54厘米

同类题4

要观察植物细胞的细胞板结构,所选择的细胞应处于有丝分裂的(  )

同类题5

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