只要外加电压不变化，交流电磁铁的吸力在吸合前、后是不变的。（）
参考答案：错
Soon, more of the information we receive via the Internet could come (31) in digital wrappers.
Wrappers are made up (32) software code that’s targeted to do specific things with the data (33) within them, such as helping to define queries for search engines. They also keep (34) from (35) access to that code.
33（）
A.close
B.closed
C.enclose
D.enclosed
下面哪一种算法属于非对称加密算法（）
A.AES
B.Rijindael
C.RSA
D.DES
