题目

– I hope you all enjoy yourselves in the World Park. – ____________.  A. Yes, we would B. Have a good time       C. Thank you    D. That’s OK 答案：C 用1块A型钢板可做2块C型钢板，1块D型钢板；用一块B型钢板可做1块C型钢板，2块D型钢板．现需15块C型钢板，18块D型钢板，可恰好用A型钢板，B型钢板各多少块？