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单片机晶振频率为12MHz，则其机器周期为 ，指令周期最多可为 。
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有一数组定义为c1234[]={0xc0,0xf9,0xa4,0xb0}，请问c1234[2]= 。
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We are honored to be invited to the seminar on computer technology to be held in Beijing next month.
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