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【单选题】
在实际选用晶闸管时,其额定电流要留有一定余量,一般取额定电流为晶闸管正常工作时通过电流的( )。A.
1~2倍
B.
2~3倍
C.
1.5~2倍
D.
1.5~3倍
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举一反三
【简答题】输入一个n(1
【单选题】In the long run, a rise in a country's price level (relative to the foreign price level) causes its currency to _________, while a rise in the country's relative productivity causes its currency to __...
A.
appreciate; appreciate.
B.
appreciate; depreciate.
C.
depreciate; appreciate.
D.
depreciate; depreciate.
【单选题】When the money market is drawn with the value of money on the vertical axis, if the price level is above the equilibrium level, there is an
A.
excess demand for money, so the price level will rise.
B.
excess demand for money, so the price level will fall.
C.
excess supply of money, so the price level will rise.
D.
excess supply of money, so the price level will fall.
【单选题】A rise in the price level causes the demand for money to _________ and the demand curve to shift to the _________
A.
decrease; right.
B.
decrease; left.
C.
increase; right.
D.
increase; left.
【单选题】According to the quantity equation, the price level would change less than proportionately with a rise in the money supply if there were also
A.
either a rise in output or a rise in the rate at which money changes hands.
B.
either a rise in output or a fall in the rate at which money changes hands.
C.
either a fall in output or a rise in the rate at which money changes hands.
D.
either a fall in output or a fall in the rate at which money changes hands.
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【简答题】输入一个n(1
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