设乙数是a，则甲数是b，所以乙是甲的ab，
则甲和乙的比是b：a；
故答案为：正确．
It's exciting to be a chairperson, but I'm _____ my ability to do all the extra work. [ ]
A. looking about
B. learning about
C. quarrelling about
D. worrying about
DTL-240中“DTL”为产品的型号，“240”为产品的________，表示适用导线的标称截面________。
