The shoes are too____. I can't put them on.
生成氧气的质量为多少克?固体残余物中含有什么物质?质量各为多少?
平时夜晚用肉眼看到最多的天体是( )
①f(f(x))=1;
②函数f(x)是偶函数;
③任意一个非零有理数T,f(x+T)=f(x)对任意x∈R恒成立;
④存在三个点A(x1,f(x1)),B(x2,f(x2)),C(x3,f(x3)),使得△ABC为等边三角形.
其中真命题的个数是( )
This is a1of Robert’s family. This man is Mr. King. He is Robert’s father. This woman is Mrs. King. She is Robert’s2. Who are this boy and this girl?3 boy is Tommy, Mr. King’s 4. And the girl is Anna, Mr. King’s daughter. Tommy and Anna are brother and sister. 5 are in the same (相同的) class. They have a happy 6.