单项选择题

2001年，NIST正式宣布将（   ）算法作为高级加密标准（AES），该算法是两位比利时的密码学家提出的。
A、MARS  
B、 Twofish  
C、Rijndael    
D、Bluefish

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不定项选择
支原体虽无细胞壁，但其细胞膜上含有的甾醇可提高其机械强度。
A．正确
B．错误
单项选择题
About the history of tea, which of the following statement is incorrect?A. Tea-drinking in China can be traced back to the Zhou Dynasty (1100- 221 BC).B. Tea was discovered by Lu Yu.C. Tea has been used as one of the sacrificial offerings to gods and ancestors in ancient times.D. Tea was also used as a funerary object in ancient times.
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