【判断题】特别提醒:完成章节任务点(观看视频、音频)后方可答题 Nick is 25 years old.
【单选题】20 钢表示其平均含碳量 . 是 ( ) 。
【单选题】Questions 22 to 25 are based on the passage you have just heard. How old is Nick?
【简答题】Watch the video. Read the statements. Write T (true) or F (false). 1 Nick is 25 years old. 2 Woo Sung speaks Chinese. 3 Natalie lives in Portugal. 4 Dan is pretty tall. 5 Woo Sung is tall and thin.
【判断题】Nick is 25 years old.
【判断题】20G钢代表的含义:20号锅炉钢,其中20表示平均含碳量为0.20%的优质碳素结构钢,G是锅炉钢的意思。