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【单选题】
某直流电路测得a点电位Va为9V,b点电位Vb为-9v,那么在计算过程中()。A.
改变计算路径,Va,Vb不再是9V,-9V
B.
参考点改变,a,b两点电位不变
C.
即使参考点.计算路径都改变,a,b两点的电位也不会改变
D.
参考点移到b点,则Vb为0V,Va将为18V
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A.
carefully
B.
secretly
C.
likely
D.
happily
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A.
put
B.
carried
C.
cut
D.
taken
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