气囊系统警告灯在发动机起动后应闪光7~9次,然后熄灭。()
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EFI系统中喷油器的驱动电路有两种,电流驱动电路和电阻驱动电路。()
According to the text, one unforeseen consequence of hand free use has been______.
A. an increased incident of unusual behavior
B. an increase in cell phone costs
C. an increase in traffic accidents
D. a decrease in brain cancer from cell phone use
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。()