怎样排除离合器打滑的故障？
参考答案：
1、清洗离合器内零件，主要是摩擦盘和压盘；
2、更换摩擦盘；
3、更换压紧弹簧。
— does it take from your home to your school?
— It takes about twenty minutes by bike.
A．How long
B．How far
C．How many
D．How much
以下有机肥中属“冷性肥料”的是（）。
A.猪粪
B.牛粪
C.马粪
D.羊粪
