若函数f（x）=ax4+bx2+c满足f′（1）=2，则f′（-1）=[ ] A

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问题选择题

若函数f（x）=ax⁴+bx²+c满足f′（1）=2，则f′（-1）=[ ]

A.-1

B.-2

C.2

D.0

答案

答案：B

选择题

—Shall I help you with your suitcase, lady?

—Thanks a ton. _______.

A．If you like

B．Of course you can

C．That couldn’t be better

D．It’s up to you

填空题

如图所示的电路图中，要使小灯泡L₁、L₂串联，必须闭合的开关是___________，若要L₁、L₂并联，必须闭合的开关是_____________。　　　　