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()；

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);

____ are the possible causes of Hamlet’s delay?

pp0=0;delay();p1=1；delay（）函数表示延时函数，没有也可以。

In a buyer’s delay shipment letter, the writer usually apologizes for delay shipment and explains the reasons, but does not need to offer the new shipment information.

Ana's flight was__1__(delay) for two hours because there was a problem with the airplane.

pp0=0;delay();p1=1；delay（）函数表示延时函数，没有也可以。 A: 正确 B: 错误

In a buyer’s delay shipment letter, the writer usually apologizes for delay shipment and explains the reasons, but does not need to offer the new shipment information. A: 正确 B: 错误

下面哪一个选项是函数调用语句？ A: void delay（unsigned int i） B: delay(20000); C: while(i--); D: while(1)