主要与获得性膜粘蛋白中富脯酸结合，阻止细菌附着的物质是
A．五倍子B．茶多酚C．甲壳素类D．氯己定E．酶类
参考答案：A
His homework _______ at home yesterday evening.[ ]
A. finished
B. was finished
C. has finished
D. will he finished
烧伤后血容量减少最快的时间是（）
A.伤后10小时
B.伤后8小时
C.伤后7小时
D.伤后2～3小时
E.伤后9小时
