采用序时控制时凭证日期应早于启用日期，不能晚于业务日期。
参考答案：错
Alice is so careful that she always goes over her test papers to ____ there are no mistakes.[ ]
A. look for
B. make sure
C. find out
D. think about
洗涤红细胞的最佳贮存温度是（）
A.1～3℃
B.2～6℃
C.2～8℃
D.＜0℃
E.8～10℃
