说的很对，就是按下“C”键就可以实现德卡里面的定速巡航功能，这点你可以放心嘿嘿，因为“C”就是代表英文“Cruise(control system)"的意思嘿嘿，但是要说明的是，当你踩下刹车了以后或按下”B“键了以后（”B“代表”Brake“的意思），定速巡航功能就自动解除了，除非你再次按下”C“键，恢复定速巡航功能呵呵，祝你一路平安，安全走天涯呵呵
Ok,above post is correct,Constant velocity function/operation or cruise control system can work if you pressed "c" button only,While you operate the brake systems it will be opened,unless you may press "C" button again for restoring the cruise control system,Don't you think so,aha!!!see you later,good-bye
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