單項(xiàng)選擇題The Wheat-stone bridge is a precision measuring instrument utilizing the principle of changes in（）.
A.inductance
B.capacitance
C.resistance
D.amperage
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1.單項(xiàng)選擇題Which of the motors for the devices listed below is fitted with an instantaneous overload relay?（）
A.Fan
B.Pump
C.Winch
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2.單項(xiàng)選擇題One factor that determines the frequency of an alternator is the（）.
A.number of turns of wire in the armature coil
B.number of magnetic poles
C.strength of the magnets used
D.output voltage
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