题目内容

My sisiter stopped the car because she saw someone his hand with his thumb raised.

A. putting away
B. putting off
C. putting out
D. putting on

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These dishes are cold. You shouldif you want to eat them.

A. heat them up
B. heat up it
C. heat it up
D. heat up them

MCS-51单片机的( )口作为输出应用时必须外接上拉电阻。

A. P0
B. P1
C. P2
D. P3

当8051单片机采用12MHz振荡频率，其1个机器周期为（）μs。

A. 0.5
B. 1
C. 2
D. 4

8051单片机内部的数据存储器容量是（）。

A. 128B
B. 256B
C. 512B
D. 1KB