无芽胞厌氧菌引起的感染不包括
A．脓肿
B．败血症
C．组织坏死
D．局部炎症
E．食物中毒
参考答案：E
As a young man, Comrade Zhou Enlai _____ the students movements and later _____ the Communist Party of China.
A．joined; took part in
B．took part in; joined
C．joined in; took part in
D．took part in; joined in
当管道直径一定时，输送液体介质的密度越大，则阻力（）。
A.越大
B.越小
C.不变
D.都可能
