下列各式中错误的是[ ]
A.a﹣b=b﹣a
B.(a﹣b)2=(b﹣a)2
C.|a﹣b|=|b﹣a|
D.a﹣b=﹣b+a
A.
He is famous both_________a novelist and poet but he is more famous_________ his novels.
A.for; as
B.with; for
C.as; for
D.like; as
一辆质量为M的汽车以恒定功率P沿倾角为θ的斜坡向上起步,汽车所受的阻力为汽车重力的k倍,则下列说法正确的是( )
A.汽车在斜坡上向上行驶的最大速度为PMg(k+sinθ)
B.汽车在斜坡上向上行驶的最大速度为PMg(k-sinθ)
C.当汽车速度为v时,汽车的加速度大小为PMv-g(sinθ+k)
D.当汽车速度为v时,汽车的加速度大小为PMv+g(sinθ-k)