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
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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