失血量>50%且大量输入库血时,以下哪些成分将缺乏,应给予补充()
A.清蛋白
B.红细胞
C.血小板
D.凝血因子
E.血浆
参考答案:A, C, D
生产聚氯乙烯的原料为(),它的分子式为(),分子量为()。
_______ a precious diamond necklace for his wife, Martin could hardly afford a tie for himself.
[ ]
A. Having bought
B. Buying
C. Being bought
D. To buy