在单片机系统中使用非编码式的矩阵键盘时如需要13个按键，则最少需要用单片机引脚（）个。
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在单片机系统中使用非编码式的矩阵键盘时如需要16个按键，则最少需要用单片机引脚（）个。
A. 6
B. 8
C. 10
D. 12
Who firstjumps up and embraces his team members excitedlyas soon as the competition ends?
A. Cole
B. Kai
C. July
D. Mler
What statements are not appeared during the competition?
A. NXT Cole is domimating!
B. NXTKai is domimating!
C. White turret destroyed!
D. NXT Taler is godlike!
Who contribute most to the success of NXT?
A. Miler
B. Kai
C. Mike
D. Cole
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