公民回中国申请Q2签证需要往返机票吗

如题，准备办Q2签证，上面说需要邀请信，但是需要在邀请信上标明（Information on the visit (purpose of visit, arrival and departure dates, place(s) to be visited, relations between the applicant and the inviting individual, financial source for expenditures)，这样看需要来回机票吗？

字面上看是没有。照办:)