临床上最为常用的血液制品是
A．洗涤红细胞B．红细胞悬液(添加剂红细胞)C．浓缩白(粒)细胞D．普通冰冻血浆E．冷沉淀
参考答案：B
1.She tried to _____ out of the window to see the procession more clearly.
A. bend B. lean C. bow D. slope
2．Throughout most of their lives, humans _____ learn and increase their mental capacity.
A. actually B. readily C. fairly D. primarily
设地球的质量为M，半径为R，其自转角速度为ω，则地球上空的同步卫星离地面的高度是（ ）
A．GMω3-R
B．3GMω2-R
C．2R
D．3GMω2-R
