洗涤红细胞保存期为（）。
A.8小时以内
B.12小时以内
C.16小时以内
D.18小时以内
E.24小时以内
参考答案：E
All the guests were dancing and singing when suddenly the light ______. [ ]
A. gave back
B. went out
C. picked up
D. carried on
直肠癌确诊过程中的3"P"检查包括（）
A.直肠指诊
B.直肠镜检查
C.结肠镜检查
D.钡灌肠造影
E.活组织检查
