速度信号速度信号可取自1个或2个速度传感器，如果LKJ采用相位防溜功能，则要求2路速度信号相位相差（）

A.30°

B.60°

C.90°或270°

D.180°

________of the land in that area________covered with trees and grass.

A．Two fifth；is

B．Two fifth；are

C．Two fifths；is

D．Two fifths；are