【单选题】According to the role packing plays in the circulation of commodities, packing is usually divided into two broad types, which are “transport packing” and “ ______ ” .
【单选题】2Packing can be divided into transport packing, inner packing and _____.
【单选题】Packing can be divided into transport packing, inner packing and _____.
【单选题】1______ , also called “inner packing”, “small packing” or “immediate packing”, is the first packing with appropriate packing materials or container or vessel after production. A. S ingle piece packing...
【多选题】以下关于对称加密的说法正确的是?
A.
在对称加密中,只有一个密钥用来加密和解密信息
B.
在对称加密中,用到了二个密钥来加密和解密信息,分别是公共密钥和私用密钥
C.
对称加密是一个简单的过程,双方都必需完全相信对方,并持有这个密钥的备份