东风4B型内燃机车两台冷却风扇的驱动采用静液压传动。
参考答案：对
3.--- I prefer a computer made in your company , but I may need some more information about the product.
--- ________.
A．Thank you
B．It’s a pleasure
C．You are welcome
D．At your service
已知函数f(x)对任意的实数x，y，都有f(x+y)=f(x)+2y(x+y)，且f(1)=1，求f(x)的解析式。
