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在宽度为a=0.60mm的狭缝后放置一焦距f=40cm的会聚透镜,若以.....
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在单位时间内蒸发扩散出来的可燃物愈少,燃烧愈猛烈。..
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He often ______ supper at restaurant.A、haveB、hadC、hasD、having..
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There ______ some chopsticks on the table.A、areB、isC、haveD、was..
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It ______ me some timeto make a plan.A、takeB、takesC、tookD、taking..
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The ______ are playing the guitar now.A、childB、childsC、childrenD、childrens..
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