考题
●In low-speed network,it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down.In high-speed networks, this approach often works poorly, because in the (71) between sending the notification and notification arriving at the source, thousands of additional (72) may arrive.In ATM network , a major tool for preventing (73) is (74) control.When a host wants a new virtual (75) ,it must describe the traffic to be offered and the service expected.(71) A.intervalB.timeC.slotD.delay(72) A.packetsB.cellsC.messageD.files(73) A.collisionB.congestionC.dropD.delay(74) A.flowB.admissionC.trafficD.time(75) A.pathB.routC.circuitD.way
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The low interest rates on bank loans provided an impetus for many to buy homes.A.incentiveB.obstacleC.reasonD.delay
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Which parameter or parameters are used to calculate OSPF cost in cisco routers?()
A. Bandwidth,Delay,and MTUB. BandwidthC. Bandwidth and MTUD. Bandwidth , MTU,Reliability,Delay,and Load
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WhichparameterorparametersareusedtocalculateOSPFcostinciscorouters?()
A.Bandwidth,Delay,andMTUBB.andwidthC.BandwidthandMTUD.Bandwidth,MTU,Reliability,Delay,andLoad
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Dumped waste might contaminate water supplies.A: destroy
B: decrease
C: pollute
D: delay
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6.设按键key按下时,产生低电平0。实现key按下时,key_state 置1的程序段是()A.if(key == 1) { delay(200); if(key == 1) key_state = 1; }B.if(key == 0) { delay(200); if(key == 0) key_state = 1; }C.while(key == 0) { delay(200); while (key == 0) key_state = 1; }D.while(key == 1) { delay(200); while (key == 1) key_state = 1; }
考题
已定义数据端口为DAC0832,声明延迟函数为delay();在 void fb(void) { (1); delay();; DAC0832-0X00; delay(); }函数的(1)处写出语句实现输出周期为2倍延时量的先高后低的方波信号。
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pp0=0;delay();p1=1;delay()函数表示延时函数,没有也可以。
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SysTick系统定时器延时1s的写法可以是()A.Delay_us(1000000);B.Delay_us(500000); Delay_us(500000);C.Delay_us(400000); Delay_us(500000); Delay_us(100000);D.Delay_us(1000000); Delay_us(1000000);
考题
函数delay(2000),可以实现延时()。