积液中粘蛋白的特点包括()。
A.由中性粒细胞和上皮细胞分泌
B.不能被稀乙酸沉淀
C.等电点为pH3~5
D.低分子蛋白质
E.酸性糖蛋白
参考答案:C, E
A large number of students in our school ______ from the countryside, the number ____ growing these years. [ ]
A. is, has been
B. are; has been
C. is, have been
D. are, have been
创伤后包扎的目的是()
A.保护伤口
B.减少污染
C.固定敷料
D.帮助止血
E.以上全是