同一客户身份资料或者交易记录采用四种同介质保存的，至少应当按照上述期限要求（）的客户
题型：单项选择题
问题：
同一客户身份资料或者交易记录采用四种同介质保存的，至少应当按照上述期限要求（）的客户身份资料或者交易记录。
A、保存四种介质
B、保存三种介质
C、保存二种介质
D、保存一种介质
题型：单项选择题
根据短文内容判断下列句子的正误，正确的用“A”，错误的用“B”。
Today there are policemen everywhere, but in 1700 London had no policemen at all. Only a few old
men protected (保护) the city streets at night.
About 300 years ago, London started to get bigger. The city was very dirty and many people were
poor. There were many thieves (小偷) in the streets. People had to stay in their homes as much as
possible.
In 1750, Henry Fielding started to pay a group of people to stop thieves. They were like policemen.
Fifty years later, there was a police force with 3,000 0fficers in London. Most of them worked on foot,
but a few rode horses.
Today, some policemen still ride horses. And the pay for them is even better than it is for other
policemen.
( )1. People could find a policeman in London in 1700.
( )2. About 300 years ago, London became a bigger city. .
( )3. People had to stay at home as much as possible because they were poor.
( )4. In 1800, there were 3,000 policemen in London.
( )5. The passage tells us the history of the London police.
根尖部的龈黏膜呈半球形隆起，不红，时有乒乒球感，富有弹性，穿刺内容呈黄色透明液体。