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模拟电压信号是连续变化的。()

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有的充电灯继电器或控制电路的控制电压不是取自发电机中性点而是从定子绕组的一相火线引出其值与N点电压一样、效果也一样均为交流发电机输出电压的一半。()

The word "leapfrogged" in paragraph 1 most probably means that______.

A. cell phone technology is rapidly becoming obsolete
B. cell phone users communicate by jumping over normal phone lines
C. cell phone use is expanding at a rapid rate
D. cell phone use has replaced and surpassed traditional phone use

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凌志400轿车(LEXUS)在正常情况下点火开头转到“ACC”或“ON”位置时，SRS警告灯应点亮6秒后熄灭。()

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霍尔效应开关是用恒流源产生信号的。()

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