题目凝点是划分柴油牌号的依据,车用柴油按照凝点分为( )个牌号。A. 4B. 5C. 6D. 7凝点是划分柴油牌号的依据,车用柴油按照凝点分为( )个牌号。A. 4B. 5C. 6D. 7题目解答答案C. 6