细菌的合成代谢产物有()
A.热原质
B.毒素与侵袭性酶
C.维生素
D.色素
E.细菌素
参考答案:A, B, C, D, E
At present obtaining more land is only possible as _____ result of urbanization, when more farmers leave _____ rural areas to work in the city.
A.a ; the
B.the ; /
C.a ; /
D.the ; the
腹外疝的先天性因素是
A.剧烈咳嗽B.长期便秘C.腹股沟三角区D.手术切口薄弱E.前列腺肥大