咳嗽、咳脓痰伴咯血、杵状指常见于 A．肝硬化腹水 B．急性胃穿孔致腹膜炎 C．胰腺囊

化脓性脑膜炎的病原菌是（）

A.RNA病毒

B.细菌

C.真菌

D.支原体

E.DNA病毒

近代侵占我国领土最多的国家是 [ ]

A、英国

B、法国

C、美国

D、俄国

A．(A) Thirty percent of the German population can receive college education.

B．(B) American students enjoy a very high rate of admission to college in the world.

C．(C) Comparatively speaking, there are more British people than the French attending college.

D．(D) American college students are envied by 60% of high school graduates around the world.

高速钢刃具淬火后为何要及时回火？