Passage ThreeQuestions 23 to 25 are based on the passage you have just heard.[音频]
A. To make Chinese companies more competitive.
B. To improve the competitiveness of European companies in China.
C. To improve Sino-EU friendship.
D. To make Sino-EU joint ventures more competitive.
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要点亮发光二极管,应给发光二极管两端接入怎样的电平()
A. 阳极高电平、阴极低电平
B. 阳极低电平、阴极高电平
C. 无法确定
MCS-51单片机共有多少个引脚()
A. 20
B. 30
C. 40
D. 50
MCS-51单片机的哪个P口可以实现第二功能()
A. P0口
B. P1口
C. P2口
D. P3口
八盏发光二极管与单片机连接时,如果所有二极管的阴极都接地,属于什么接法()
A. 共阳极接法
B. 共阴极接法
C. 无法确定