Parallelism is used in ________.
A、It sells us instant gratification. It diverts us only to divert, to make the time pass without pain.
B、Consider the casual assumptions that television tends to cultivate: that complexity must be avoided, that visual stimulation is a substitute for thought, that verbal precisio is an anachronism.
C、Television’s variety becomes a narcotic, not a stimulus.
D、Everything about this nation – the structure of the society, its forms of family organization, its economy, its place in the world – has become more complex, not less.
第1题:
第2题:
3、超纯水的电导率是()。
A.小于0.1uS/cm
B.0.5-2uS/cm
C.2-4uS/cm
D.50-500uS/cm
第3题:
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);
第4题:
第5题:
若51单片机使用频率为6MHz的晶振,则振荡周期为:,机器周期为:,指令周期为:
A.1/6us,2us,不定
B.1/12us,2us,1/3us
C.1/6us,1us,不定
D.1/12us,1us,1/3us
第6题:
若系统晶震频率为6MHZ,则机器周期为_______us,最短和最长指令周期分别为_______us和_______us。