西服门襟止口弯曲，不直，还口的原因有（）
A.缉止口不直
B.牵带敷太松
C.烫止口时将止口拔宽了
D.牵带敷太紧
参考答案：A, B, C
The young man made a ______ to his parents that he would try to earn his own living after graduation. [ ]
A. prediction
B. promise
C. plan
D. contribution
《中国民用航空通信导航监视系统运行、维护规程》第十七条规定，设备在运行过程中发生故障，必须立即启动应急保障程序。
