【单选题】以下关子VPN说法正确的是()。
A.
VPN指的是用户自己租用线路.和公共网络物理上完全隔离的、安全的线路
B.
VPN指的是用户通过公用网络建立的临时的、安全的连接
D.
VPN只能提供身份认证、不能提供加密数据的功能
【多选题】《危险化学品安全管理条例》规定,经营危险化学品,不得有( )行为。
A.
从未取得危险化学品生产许可证或者危险化学品经营许可证的企业采购危险化学品
B.
销售没有化学品安全技术说明书和化学品安全标签的危险化学品
【判断题】未取得危险化学品经营许可证,任何单位和个人不得经营危险化学品。
【多选题】经营危险化学品,不得
A.
从未取得危险化学品生产和经营许可证的企业采购危险化学品
C.
销售没有化学品安全技术说明书和安全标签的危险化学品
【多选题】经营危险化学品,不得有( )的行为。
A.
从未取得危险化学品生产许可证或者危险化学品经营许可证的企业采购危险化学
B.
经营国家明令禁止的危险化学品和剧毒化学品生产的灭鼠药
【简答题】ABC CO. 8 Jianguomen Nei Dajie Beijing 100005, China Telephone:86-10-20000000 Fax:86-10-20000000 E-mail Address: abcde@abc.com.cn Date: July 10, 2015 ABCD Ltd. P.O. Box1234, Daytona Beach FL 32150, U...
【单选题】听力原文:W: I thought the librarian said we could check out as many books as we need without our library cards. M: That' s right, but not those reference books. Q: What does the man mean? (13)
A.
Students with a library card can check any book out.
B.
Reference books are not allowed to be checked out.
C.
Only students with a library card can check out reference books.
D.
The number of books a student can check out it unlimited.
【判断题】From the movie, we can know that in 1920s, there was a trend that most young people thought learning science was better to the nation than learning literature. ( )
【单选题】I thought we'd be late for the concert,________ we ended up getting there ahead of time.