在产褥感染中,下列哪种细菌感染最易引起菌血症
A.溶血性链球菌
B.大肠杆菌属
C.脆弱类杆菌
D.金黄色葡萄球菌
E.厌氧性球菌
参考答案:B
Many people stood near the bus stop, nervously waiting ______.
A.to pick up
B.picking up
C.to be picked up
D.being picked up
简述我国外汇的来源及其构成。