单项选择题

Bob's work proved_______than that of others.
much better
B、not more better
C、not more as good
D、not much as good

A、not

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单项选择题

功率因数为1时可把励磁电流称为为()

A、过励
B、正励
C、欠励
D、负励

单项选择题

受弯适筋梁My

A、ρ大，△M/Mu小
B、ρ大，△M/Mu大
C、ρ大，△M/Mu不变
D、ρ和△M/Mu无关