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 stimul

题目

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.


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  • 第1题:


    A.U=Us-R×I
    B.U=Us+R×I
    C.U=-Us-R×I
    D.U=-Us+R×I

    答案:B
    解析:

  • 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


    0.2

  • 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);


    BC

  • 第4题:


    A.U=US?R×I
    B.U=US+R×I
    C.U=?US?R×I
    D.U=?US+R×I

    答案:B
    解析:
    电压与电流为非关联参考方向,在电压与电流的表达式中使用负号。因此,端口电压U=US?R×(?I)=US+R×I。该题还可以从电压、电流的的参考方向与实际方向的关系这一角度考查。出题陷阱:二端口的电压方向与电压方向一致,因此C、D错误;参考电流方向与参考电压方向不一致,因此A错误。部分同学误选择A,未能理解非关联参考方向的意义。

  • 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


    2μs;2微秒

  • 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。


    B