在MCS-51单片机中的中断源有()个,分别为() 、() 、() 、 ()和()。
MCS-51单片机有2级优先级。()
A. 对
B. 错
The history of ballet began in Italy during the 15th and 16th centuries.
A. F
B. O
Youngesters should settle their rivalries through competitive dance instead of fighting.
A. F
B. O