stop delay
举一反三
- The underlined word in paragraph 5 means ______. A: long lasting B: continual, without stop C: to do directly, without delay D: at once
- P0.0所控制LED被命名为LED。下面程序片段中()可以使LED闪烁两次。A.()LED=0；delay()；()B.()LED=0；delay()；LED=1；delay()；()C.()LED=0；delay()；LED=1；delay()；()LED=0；delay()；LED=1；delay()；()D.()LED=0；delay()()LED=1；delay()；()LED=0；delay()()LED=1；delay()；
- 函数定义语句如下：void delay(unsigned char i);以下正确的调用语句是。 A: delay(100) B: delay(260) C: delay(1000) D: delay(20000)
- Which of the following expressions mean “延误会有多久” ？ A: What’s the extent of the delay? B: How often is the delay last? C: How long will the delay be? D: When’s the delay?
- 利用PWM技术控制电机的调速，下面能正常运行的是（ ）。 A: MotorA=0；MotorB=1;delay(80);MotorA=0；MotorB=0;delay(20); B: MotorA=0;delay(400);MotorB=1;delay(400); C: MotorB=0;MotorB=0;delay(80);MotorA=0；MotorB=0;delay(20); D: MotorB=1;MotorB=1;delay(80);MotorA=1；MotorB=1;delay(20);