单项选择题

请判断以下说法是否正确
原核细胞容易受到外界环境的影响造成DNA损伤，其移损合成酶通常受到RecA蛋白的转录激活作用而活跃表达

A．correct
B．incorrect

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单项选择题
传输通道在连接时要注意信号屏蔽、阻抗匹配等问题。
A．对
B．错
问答题
what are the essential elements in making an impressive self-introduction?
Greeting, basic information, purpose of coming, __________________, social activities and internship, characters and confidence.
答案：academic achievements