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【单选题】
关于电介质中的高斯定理，下列说法中正确的是A.
若通过闭合曲面的电位移通量为零，该曲面内一定没有自由电荷。
B.
若通过闭合曲面的电位移通量为零，该曲面内电荷的代数和一定为零。
C.
电介质中的高斯定理 表明电位移矢量仅与自由电荷的分布有关。
D.
介质中的 电位移矢量与自由电荷和极化电荷的分布均有关。
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举一反三
【单选题】The minister refused to give any ____on the fact that many workers were out of jobs.
A.
comment
B.
answer
C.
reply
D.
response
【单选题】The minister refused to give any _____ on the fact that many workers were out of jobs
A.
response
B.
reply
C.
answer
D.
comment
【单选题】The minister refused to give any _____ on the fact that many workers were out of jobs.
A.
responsse
B.
reply
C.
answer
D.
comment
【单选题】The minister refused to ______ on the rumor of his resignation.
A.
comment
B.
commentary
C.
comments
D.
content
【单选题】The minister refused to comment on _______ cases.
A.
individual
B.
national
C.
world
D.
government
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