挑战习题
1/7单选题
难度:

1.如图表示四冲程内燃机工作时各冲程的示意图,它们正确的排列顺序为(  )青果学院
A 甲、乙、丙、丁
B 丁、丙、乙、甲
C 甲、丙、乙、丁
D 甲、丁、乙、丙
提示1:
IOeUsuaYr+WQuOawlOWGsueoi++8m+S5meaYr+WBmuWKn+WGsueoi++8m+S4meaYr+aOkuawlOWGsueoi++8m+S4geaYr+WOi+e8qeWGsueoiw==
正确答案:RA==
PGRpdj7nlLLmmK/lkLjmsJTlhrLnqIvvvJvkuZnmmK/lgZrlip/lhrLnqIvvvJvkuJnmmK/mjpLmsJTlhrLnqIvvvJvkuIHmmK/ljovnvKnlhrLnqIvvvIzliJlE6YCJ6aG55q2j56GuPC9kaXY+