普通话语音有这样一条规则：塞音和塞擦音声母与鼻韵母在阳平调中相拼时，声母只能是送气的p、t、k、c、ch、q，不能是不送气的b、d、ɡ、z、zh、j。例如只有tínɡ（“停、廷”）没有dínɡ，只有chénɡ（“城、呈”）没有zhénɡ，等等。但是也有例外，在《新华字典》和《现 Mandarin voice has such a rule: when the priming and affricate consonants and nose vowels are matched in the yangping tune, the consonants can only be p, t, k, c, ch, q for aspiration, and cannot be unaspirated b, d , ɡ, z, zh, j. For example, only tínɡ (“stop, court”) has no dínɡ, only chénɡ (“city, presentation”) does not have zhénɡ, and so on. But there are exceptions in the Xinhua Dictionary and