在商品退货的操作中,顾客在红票上签字属于哪一步()
A、检查
B、记录
C、道歉
D、处理
E、征询
参考答案:D
The warning we were given as children ________ an apple a day keeps the doctor away may,in fact,have a scientific explanation.
A.that
B.who
C.where
D.which
病毒标本长期保存应置予()。
A.-30℃
B.-70℃
C.-20℃
D.0℃
E.4℃