用括号内所给单词的适当形式填空。 1.These are Jim and Tim. _____________________________ (It) are brothers. 2.Are __________________________ (that) your brothers? 3.Two _____________
Real policemen hardly recognize any resemblance between their lives and what they see on TV.The first difference is that a policeman’s real life revolved round criminal law. He has to know exactly w
的芯片上能集成10亿个元件，每一个这样的元件占多少平方毫米？（用科学记数法表示）.