题目内容

第二代计算机的主要元件是电子管。

A. 对
B. 错

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美玉不易得。一块不成形状的石头经过锯割，打磨，雕刻，才能现其光滑。8000年来，玉始终伴随着中国人的生活。It is difficult to beautiful jade. Only through the delicate procedure of cutting, and carving a piece of unshaped stone can . Yu has _ in people’s lives in China for the last 8,000 years

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