工程竣工验收备案、交付使用的必备文件是()。
A.解除缺陷责任证书
B.工程接收证书
C.结清单
D.竣工结算书
参考答案：D
国际票的OK票和OPEN票各是指什么？
根据汉语提示完成句子。
1. Who won the first prize in yesterday's ________ (竞赛) .
2. Deng Yaping is a famous ping-pong ________ (运动员 ).
3. Her sister wants to be a teacher in the ________ (将来).
4. I didn't hear clearly. Please say it ________ (再一次).
