亚急性细菌性心内膜炎最常见的病因是
A.金黄色葡萄球菌
B.溶血性链球菌
C.草绿色链球菌
D.大肠杆菌
E.肺炎球菌
参考答案:C
挖槽土石方的计算方法有()和平均水深法。
— _____ is the population of your city?
— About two million. [ ]
A. How
B. What
C. How many
D. How much