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游客因低血糖晕厥时,要立即喂食含糖食物或饮料。( )
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Current flow is represented by the letter symbol I.
One milliampere is equivalent to one－thousandth(0.001)of an ampere，and one microampere is equivalent to one-billionth(0.000 000 001)of an ampere.
The term voltage is commonly used to indicate a difference in potential bat electromotive force is not.
One kilovolt equals one thousand volts.
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