发动机润滑系常见故障有：（）、（）、（）。
参考答案：机油消耗过多；机油压力过高；机油压力过低
— Would you like to come to my birthday party?
— Yes, ______ I'm very busy. [ ]
A. I like to, and
B. I'm glad to, but
C. I'd like to, but
D. I would like, and
（a-b）2+2（b-a）2=______．
