She can't _____________ an apple. [ ]
A. found
B. find
C. to find
答案:B
简述“首次蓄水期”、“初蓄期、”“运行期”。
多次输血的贫血病人输血时用()
A.全血
B.浓缩白细胞
C.血小板制剂
D.血清蛋白
E.洗涤红细胞