A:赤道
B:南极
C:北极
D:北回归线
_______ his help, I finished the job in time.
用1,2,3,4,5,6组成数字不重复的六位数,满足1不在左右两端,2,4,6三个偶数中,有且只有两个偶数相邻,则这样的六位数的个数为( )