“三违”是指违章指挥、违反劳动纪律、（）。
A、违反《行规》
B、违反《技规》
C、违反岗位职责
D、违反操作程序
参考答案：D
Now the air in our city is ______ than it used to be. Something must be done to stop it. [ ]
A. very good
B. much better
C. rather bad
D. even worse
对不同地层牙轮钻头的选型原则？
