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下列属于单细胞生物的是( ) A.眼虫B.海带C.苔藓D.松树
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_______ his father_______ his mother are a teacher. They are in the same school.
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闭合开关S后,小磁针静止时北极的指向如图所示,则螺线管左端是______极(选填“N”或“S”),电源左端是______极(选填“正”或“负”).
1年前
Assistant: Can I help you? Mum: Yes, please. I want to buy a pair of sneakers(网球鞋) for my son.
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