当人受轻伤流血时,能自动止血,其凝血作用的是[ ]
A.白细胞
B.血红蛋白
C.血小板
D.浓缩的血浆
答案:C
________ away from school for two weeks, I have quite a few lessons to catch up with.
A.Having been
B.To be
C.Been
D.Being
发现脂肪瘤即需手术切除。()