DES, the United States Data Encryption Standard, is a block cipher algorithm with 8-byte long blocks and a key length of 56 bits.
即美国国家数据加密标准(the United States DataEncryption Standard)，是一个块密码算法，块长8字节，密钥长56位。
Can be drilled out with standard oilfield drill bits or can withstand perforation.
可被油田标准钻头钻穿，同时能够承受射孔压力；
Can be drilled out with standard oilfield drill bits or can withstand perforation.
可被油田标准钻头钻穿，同时能够承受射孔压力；
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