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发光强度是光线在给定方向上发光强度的度量，其单位为（）。
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【简答题】When I was small, I was very shy. I (81) ________ went out to play with other children. One day, my cousin asked me to play soccer with him. But I was (82) ________(worry) that the ball would hit(打) m...
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【简答题】非语言沟通包括哪些要素?
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