红色和橙色在色相环里属于（）
A.近似色
B.互补色
C.对比色
D.同类色
参考答案：D
— Would you please tell me _________?
— In half an hour.
A. when the plane left B. when the plane will leave C. when will the plane leave
试述电空制动控制器在运转位，三针一致，制动管发生过量供给的原因及处理方法？
