当电路中综合阻抗十分微小，在不高的电源电压下会出现极大的电流，这个极大的电流在电感、电容上产生很高的电压降，就是()
A. 工频过电压
B. 谐振过电压
C. 操作过电压
D. 感应雷过电压
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碳钢及低合金钢消除应力时的退火温度为()。
A. 980 °C
药品出库应依据的原则是()
A. 先产先出
B. 近期先出
C. 按批号发货
D. 以上均是
The two household floor cleaners tested in the study, PineSol and Freshness, are ------- competent in removing unwanted stains.
A. equal
B. equally
C. equality
D. equaled
The last paragraph focuses on______.
A. what a Segway is like
B. where to find a Segway
C. how to control a Segway
D. when a Segway is useful
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