微分方程(x+y)dy+(y+1)dx=0满足y(1)=2的特解是______．
参考答案：
解析：[*]
Beijing is cold this time _________. You need _______ warm clothes if you go there.
A．of the year, to pack
B．of year, packing
C．of year, pack
D．of year, to pack
三段式距离保护中第Ⅰ段的保护范围是线路全长的_________。
