单项选择题
共阳极数码管是( )电平点亮,共阴极数码管是( )电平点亮。
A.高,低
B.低,高
C.高,高
D.低,低
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单项选择题
Nancy: Do you have anything special to do this afternoon? Bill: __________________. A、Anything special B、Special anything C、Nothing special D、Special nothing
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单项选择题
Which of the following is generally considered as an important institutional factor that contributed to the success of American business and industry? A、Laissez-faire B、Bountiful resources C、Vast dimensions D、Entrepreneurial spirit
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