下列方程中是二项方程的是( )
A:x4+x=0
B:x5=0
C:x3+x=1
D:12x3+8=0
-- Anna, could you lend me this book, please?
-- I'm sorry. I it for only two days, and I haven't finished it yet.
如图,螺线管匝数n=1500匝,横截面积S=0.002m2,螺线管导线电阻r=1Ω,电阻R=4Ω,磁感应强度B的B﹣t图像(以向右为正方向),下列说法正确的是( )
澶渊之盟签订双方是( )
下列各项中划横线的词语完全不是古今异义的一项是( )