题型:选择题 The pilot asked all the passengers on board to remain _________ as the plane was making a landing. A.seatB.seatingC.seatedD.to be seating 查看答案
题型:选择题 已知函数f(x)=xn+an-1xn-1+an-2xn-2+…+a1x+a0(n>2且n∈N*),设x0是函数f(x)的零点的最大值,则下述论断一定错误的是[ ]A.f'(x0)≠0B.f'(x0)=0C.f'(x0)>0D.f'(x0)<0 查看答案