金桥盐业公司持未到期承兑汇票向苍梧支行申请票据贴现，该贴现期限最长不得超过（）
A.3个月
B.6个月
C.9个月
D.12个月
参考答案：B
It’s obvious that his ______ to the problem is wrong, so we’d better try another way to solve it.
A．way
B．means
C．approach
D．intention
以硫酸作Ba2+的沉淀剂，其过量的适宜百分数为（）。
A.100%-200%
B.20%-30%
C.10%-20%
D.50-100%
