LIN系统是单线工作模式。
参考答案:对
______ the project in time, the staff have been working at weekends since last summer.
A.Completing
B.Having completed
C.To have completed
D.To complete
质量保证大纲的有效实施取决于工作的()
A.管理人员
B.执行人员
C.检验人员
D.上述三类人员