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如图所示,吸管放在支架上,能在水平面内自有转动,用餐巾纸摩擦吸管使其带电.

上一题 下一题 0.0难度 选择题 更新时间:2019-05-25 11:53:22

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同类题1

设若是与的等比中项,则的最小值为(   )

同类题2

    Little Tom likes cartoons very much .When the cartoons begin on TV, he does nothing until they' re over. Sometimes he'd rather wait for a long time and go to bed late. In the morning his mother has to wake him up, or he will be late for school.
    Yesterday Tom heard there would be an interesting cartoon today. This morning, as soon as he got up, he turned the television, but didn't receive the programme. He had to have breakfast and then went to school. After school he ran home while his mother was cooking supper in the kitchen (厨房). He hurried to the sitting room and turned on the television again, but he couldn’t find the cartoon. He rushed into the kitchen and asked his mother to help.
    “It's only five now,”said the woman. “Your programme will be after supper.”
    “Well, let's have supper right now!”

同类题3

计算:sin30°tan45°﹣cos30°tan30°+sin45°tan60°=____.

同类题4

选择填空。

 Was   were   had

同类题5

P是⊙O外一点,PA、PB分别交⊙O于C、D两点,已知 AB^ 、 CD^ 的度数别为88°、32°,则∠P的度数为(   )

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