题目内容

由磁路欧姆定理可知,磁路中的磁通与磁阻( )。A. 成正比关系B. 成反比关系C. 无关系

A
B
C

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磁阻和电阻一样是一个常数。

A. 对
B. 错

Germany has the __________national economy in Europe.

A. large
B. largest
C. larger
D. little

Each year several famous beer festivals ____________in Germany.

A. is held
B. are held
C. hold
D. held

Canada is the world's second-largest country _________total area.

A. from
B. of
C. by
D. in

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