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梯形的上底长8厘米,下底长14厘米,底的一半。梯形的面积是( )平方厘米。
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【简答题】In ancient times wealth was measured and exchanged in things that could be touched: food, tools, and precious metals and stones. Then the barter system was replaced by coins, which still had real valu...
【简答题】1 The Chinese may have known about the Olympic s in ancient times. 2 The need for sport is present in all societies. 3 In ancient Greece people preferred sport to fighting. 4 Sport can replace con...
【简答题】正常人体血浆渗透压为____,相当于血浆渗透浓度为____。
【简答题】正常人体血浆渗透压为 ,相当于血浆渗透浓度为 。
【简答题】根据对称性可将晶体分为 个晶族, 个晶系。
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【单选题】基因型为Mm的动物，在其精子形成过程中，基因MM、mm、Mm的分开，分别发生在 ①精原细胞形成初级精母细胞 ②初级精母细胞形成次级精母细胞 ③次级精母细胞形成精细胞 ④精细胞变形成精子 [ ]
A.
①②③
B.
③③②
C.
②②②
D.
②③④
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