单项选择题
在变频调速时,对于恒转矩负载,电压与频率的变化关系是( )
A.U1 /1f
B.1f/U1
C. U1/f1
D.f1 /1U
A.U1
B.1f/U1
C.f1
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单项选择题
一肥料包装袋上印有12-12-12,表明该肥料含有( ) A. 12%N,12%P2O5,12%K2O B.12%N,12%P,12%K C. 12 N:12 P2O5:12 K2O D.12%N2O,12% P2O5 ,12% K2O
A.12%N,12%P,12%K
B.12%N2O,12%
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单项选择题
I didn't know what to do but then an idea suddenly () to me.A、A happenedB、B enteredC、C occurredD、D hit
A.
A、A
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