问题
判断题
当调压器失灵,总风缸空气压力达到900kPa时,保安阀开启,确保空压机和总风缸的安全。
答案
参考答案:错
当调压器失灵,总风缸空气压力达到900kPa时,保安阀开启,确保空压机和总风缸的安全。
参考答案:错
从方框中所给的选项中选择正确的选项补全对话。 | |
B: Sure. My name is John. A: (2)_______ B: Yes, I do. Look, this is a letter from my pen pal. A: (3)_______ B: He is a cook. A: (4)_______ B: He lives in Canada. A: (5)_______ B: In the letter, he says he wants to visit me next month. 1._______ 2._______ 3._______ 4._______ 5._______ |