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下列物体中不属于光源的是: [ ] A.萤火虫 B.点燃的蜡烛 C.点亮的电灯 D.月亮
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成功培育“试管山羊”的基本过程如下,有关叙述错误的是 [ ]
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句型转换。 There are different ways of doing this. There are ____________ ways of doing this.
1年前
如图所示,凸透镜的焦距为10cm,保持透镜位置不变,当蜡烛在10cm刻度处时,为了在光屏的中心找到像,应调整光屏的_______,并将光屏向_______方向移动(选填“远离透镜”或“靠近透镜").
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Researchers have found that there are some basic things that you can do to become happier.
1年前