输血时，主要考虑供血者的_______不被受血者_______所凝集。
参考答案：红细胞、 血清
From the deep valley ______, which had my heart in my mouth.
A．came a frightening sound
B．a frightening sound came there
C．did a frightening sound come
D．a frightening sound did come
配置项测试的依据是 ______。
A．详细设计说明 B．概要设计说明C．软件需求规格说明 D．用户需求
