患儿刘某,家中进食时突发吸气性呼吸困难伴刺激性干咳,最可能的原因是()
A.哮喘发作
B.自发性气胸
C.气管异物
D.肺水肿
E.心衰
参考答案:C
翻译下列短语。
1. read the newspaper ______________________
2. play cards ______________________
3. have fun ______________________
4. play with..... ______________________
5. on the train ______________________
6. some soup ______________________
如何克服电源转换过程中电源中断现象?