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第一课时一、课前交流,介绍钱学森师:同学们,知道宋丹丹的请举手。(学生高举小手)师:你们知道宋丹丹是干什么的?
First class hours a, pre-class exchange, introduced Qian Xuesen division: classmates, please know Song Dandan please raise your hand. (Students raise their hands) Teacher: Do you know what Song Dandan is doing?