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【单选题】
在采用电流驱动方式的喷油器控制电路中,不需附加电阻值,直接与( )连接。A.
正极
B.
负极
C.
蓄电池
D.
交流电
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举一反三
【单选题】Under fixed exchange rate, in general
A.
the expected rate of domestic currency depreciation is high
B.
the expected rate of currency depreciation is one
C.
the domestic and foreign interest rates are equal, R = R
D.
the foreign and domestic interest rates are unequa
【单选题】A fixed exchange rate system without a band of allowed fluctuation would require the nation's monetary authorities to intervene in the foreign exchange market______.
A.
never
B.
seldom
C.
constantly
D.
we cannot say
【单选题】Thermocouples are often used to measure _____ in the machines.
A.
liquid viscosity
B.
pressure
C.
rotate
D.
temperature
【单选题】In a fixed exchange rate system, speculative selling of a currency is based on anticipation of
A.
appreciation
B.
devaluation
C.
a foreign trade surplus
D.
interest rate increase
【单选题】Thermocouples often be used to measure ________ in the machinery.
A.
pressure
B.
liquid viscosity
C.
temperature
D.
rotate
【单选题】Thermocouples are often used for measuring temperatures, which of the following descriptions are valid for a thermocouple?
A.
A junction between two dissimilar metals generates a small voltage.
B.
A semi-conductor device that exhibits a negative coefficient of, resistance with temperature.
C.
A resistance device that exhibits a positive coefficient of resistance with temperature.
D.
A quartz crystal that changes its resonant frequency with temperature.
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