如要输注血浆量最少的血液，可选用（）。
A.浓缩红细胞
B.洗涤红细胞
C.冷冻红细胞
D.以上均不可
E.以上均可
参考答案：B
He's got himself into a dangerous situation ___he is likely to lose control over the plane.[ ]
A. where
B. which
C. while
D. why
