A:滤液A中的阳离子为
B:V =224
C:样品中CuO的质量为4.0g
D:V =448
用反证法证明命题“三角形中必有一个内角小于或等于60°”时,首先应该假设这个三角形中( )
西瓜的果肉属于植物哪类组织?( )
阅读短文, 选择正确的答案。
The red coat is my mother's. It's very beautiful. The brown jacket is my father's. The blue pants are my brother's. They're new. The orange shorts aye my sister's. She likes them very much. The green socks are mine.