进行性肌营养不良患者多在25~30岁死于
A.消化道感染
B.消耗性疾病
C.呼吸道感染
D.心力衰竭
E.泌尿系感染
参考答案:B,C,D
The manager ______ the worker how to do it, or the accident couldn’t have happened.
A.couldn’t have told
B.ought to tell
C.could have told
D.mustn’t have told
以下货物可以混装在同一集装箱内的是()
A.干、湿货物
B.茶叶与鱼粉
C.装饰品与石墨
D.含氧气钢瓶与含氮气钢瓶