排气温度传感器用来检测（）；用以判断（）。
参考答案：再循环废气的温度；废气再循环系统工作是否正常
_________, I could have done something.
A．Told you me earlier
B．Should you tell me earlier
C．Were you to tell me earlier
D．Had you told me earlier
按运动轴数目和关节面形状，一般将关节分为以下几类（）
A.单轴关节
B.双轴关节
C.多轴关节
D.可动关节
E.制动关节
