胸背痛伴发热、气促、咳嗽时加重等，最可能的疾病是（）
A.胸膜炎
B.急性胆囊炎
C.肺结核
D.支气管扩张
E.急性胰腺炎
参考答案：A
B737-700飞机采用的供电原则是（）。
A、交流系统单独供电，直流系统并联供电
B、交流系统并联供电，直流系统单独供电
C、交、直流系统都是单独供电
D、交、直流系统都是并联供电
We all agree with you, so we hope you _____ change your idea. [ ]
A. had better not to
B. would better not
C. would better not to
D. had better not
