下列哪些属于重要空白凭证（）
A、存单
B、存折
C、存款证明
D、存款开户证明
E、汇票
F、银行卡
参考答案：A, B, C, D, E, F
The girl didn't Iike to the boy to the party, but she couldn't find a way to refuse him. [ ]
A. accompany
B. attract
C. advise
D. suggest
中变催化剂为什么要还原？
