【简答题】1 The operator moved the brake valve to “_____________” when he saw a car on the track. 2 Before the ______________________ was installed, the train had too many wires. 3 Air brakes tend to have a lo...
【单选题】根据以下材料,回答题 I once had a friend that was diagnosed with, terminal cancer, and the news that he might only live up to six months was a great shock to him, his family, and his friends.However, in spite o...