题目内容

单片机的工作电压都是5V。

A. 对
B. 错

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单片机工作频率越高，单片机的运算速度将越快。

A. 对
B. 错

当8051单片机的晶振频率为12MHZ时，ALE地址锁存信号端的输出频率为2MHZ的方脉冲。

A. 对
B. 错

you pay in advance, we won' t charge you for delivery.

As long as
B. As though
C. In order that
D. even though

Once customers come to rely ___ these systems, they almost never take their business elsewehere.

A. on
B. at
C. of
D. by