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【单选题】
当政府设置限制性价格下线时它会引起_______A.
供给曲线向左移动
B.
需求曲线向右移动
C.
物品短缺
D.
物品过剩
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举一反三
【单选题】— When was he born? — He was born _____. [ ]
A.
on August 3rd, 1975
B.
in August 3rd, 1975
C.
on August
D.
in August 3
【单选题】It can be inferred from the passage that scientists are currently making efforts to observe which of the following events?
A.
The decay of a vacuum in the presence of virtual particles.
B.
The decay of a vacuum next to a super heavy atomic nucleus.
C.
The creation of a super heavy atomic nucleus next to an intense electric field.
D.
The creation of a virtual electron and a virtual positron as a result of fluctuations of a vacuum.
【单选题】在正弦交流电路中,感性负载两端并联合适电容提高功率因数时,电路某些电量将发生变化,以下描述错误的是( )。
A.
线路总电流减小
B.
负载支路上的电流不变
C.
负载支路上的功率因数增大
D.
线路有功功率不变
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