收缩蛋白的β链用限制性胰蛋白酶消化后，经SDS-PAGE分析显示（）
A.2个肽段
B.3个肽段
C.4个肽段
D.5个肽段
E.6个肽段
参考答案：C
改错下面每句划线部分的ABCD中均有一处错误请找出。将其序号填入题前的括号中并订正在题前的横线上。（共5题;每题1分，满分5分）
小题1:I have a e-dog.It is lovely.I like it very much.( )（ ）
A B C D
小题2:What does he look? He looks strong. ( ) ( )
小题3:Our English teacher is tall and slim. She wears glass.( )( )
小题4:Everyone in the classroom is glad. Their hobbies is swimming after school.( )( )
小题5:Sandy comefrom Beijing, but he lives in Donghai now.( )( )
有一名20岁女性病人，外伤后有血性脑脊液自鼻腔溢出，应采取处置是
A．鼻腔填塞压迫止血
B．鼻腔冲洗
C．给予抗生素治疗
D．腰穿放血性脑脊液
E．头低位以利引流
