资产分类，即银行账户与交易账户的划分是商业银行实施市场风险管理和计提市场风险资本的前提和基础。
参考答案：对
--May I put my bag here?
--No, you________. You should put it up on the shelf
A. needn't B. mustn't C. won't
学英语很重要。
