发作性呼吸困难伴有哮鸣音可能诊断为 ()
A.支气管哮喘
B.脑出血
C.大叶性肺炎
D.肺脓肿
E.急性左心衰
参考答案:A
If your race car isn't insured, you may_________ losing everything when it hit something solid. [ ]
A. delay
B. deny
C. avoid
D. risk
如何表示国产晶体管型号?怎样命名?