At first he used paper 1.with holes to make a sound.

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• 初一的题目（科学和英语）科学：小明用100牛的水平方向的力去推放在水平面的桌子,课桌在30秒内匀速移动了6米.已知课桌的质量为30千克.求：（1）课桌受到的摩擦力为多大?（2）小明推课桌的速度为多少?英语嘻……Thomas Edison was one of the greatest inventors in the world.Without his inventors,people may not have lights,films and many other things.But this very elever man had very little scholing.Edison began to make a talking machine in 1877.At first,he used paper to make a soud.He worked for months on this idea.At last he found out how to record a person
• At first he used paper 1.with holes to make a sound.为什么填with.
• He used paper_____holes to make a sound横线上填什么?
• He used paper_____holes to make a sound
• At first he used paper 1.with holes to make a sound.
• 英语翻译American Arthur Fry inventde the Post-it note in 1974.At first,he wanted to find a better bookmark (书签) One day,he saw his friend's special glue (胶水).The glue is strong enough to stick on paper.Also there is no mark (痕迹) when you take it away.Fry used the glue on a piece of paper to make his new bookmark.Today,people around the world use Post notes.
• He used paper_____holes to make a sound
• 请分析一下这题 haven't you realized the use we make of the used paper