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
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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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细菌鞭毛的成分是蛋白质 A、正确 B、错误
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