导致继发性腹膜炎的最常见致病菌是()
A.厌氧菌
B.大肠杆菌
C.肺炎双球菌
D.溶血性链球菌
E.多种细菌的混合感染
参考答案:B
肌肉活检最常用的取材部位有
A.肱二头肌
B.股四头肌
C.腓肠肌
D.背阔肌
E.三角肌
They found there was_____ to weigh such an elephant.
A.big enough nothing
B.nothing enough big
C.enough nothing big
D.nothing big enough