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掌击下颌适用于歹徒企图从正面强行搂抱接吻时。
危机的发生与个人的性格有着很大的关系。（）
The development of electronics has had three important steps: computer, intergrated circuit and vacuum tube.
The most advanced intergrated circuits are the microprocessors,which controls everything from computers and cellular phones to digital microwave ovens.
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