规定a﹡b=5a+2b﹣1,则(﹣4)﹡6的值为( )
﹣9
在甲、乙两个不同导体两端加相同的电压,但产生的电流I甲>I乙,则甲导体的电阻 ______乙导体的电阻.
--- What’s this?
--- __________.
A.It is an “H”.
B.It is “H”.
C.It is a “H”.
D.Is “H”.