【多选题】【消耗次数：1】
CA中心主要职责:??
①
颁发数字证书?
②
管理数字证书?
③
确定安全的支付方式?
④
制定电子商务安全标准
参考答案：
复制
纠错
相关题目
【多选题】
下列对数字证书说法正确的是（）。
①
数据证实又称为公明证书、公钥数字证书
②
数据证书文件的拓展名是.cet
③
签发数据证书的权威机构是SA又称证书授权中心
④
数据证书主要用来证明用户与用户持有的公钥之间的关联性
随机题目
【单选题】
This is the hotel _______last month.
①
which they stayed
②
at that they stayed
③
where they stayed at
④
where they stayed
【单选题】
People’s status in society is frequently ____ by how
much they own.
①
measured
②
examined
③
tested
④
questioned
【单选题】
Jack is so ____ to his appearance that he never has his clothes pressed.
①
adverse
②
anonymous
③
indifferent
④
casual
【单选题】
It’s no good ____ him. He is always indifferent towards others’ matters.
①
to turn to
②
turning to
③
turn to
④
turned to
【单选题】
The child tiptoed（翘起脚尖走）quietly to the bird.
_____ into the forest when he was about to catch it.
①
Flew it away
②
Away flew it
③
Away it flew
④
Flew away it
【单选题】
In order to prepare a lecture, one must do a lot of research
and spend plenty of time____ his material so that his speech
is clear and easy to follow.
①
organizing
②
managing
③
operating
④
breeding
【单选题】
Just as the soil is a part of the earth, ____ the
atmosphere.
①
as it is
②
so is
③
the same as
④
and so is
【单选题】
Some words are hard to____ because they have too many
different uses.
①
express
②
explain
③
define
④
describe