未分类题
A.沿热流方向逐渐减小B.沿热流方向逐渐加大C.沿热流方向保持不变D.在热阻大的材料层中较大,热阻小的材料层中较小
A.Send out the invitations.B.Arrange for accommodations.C.Welcome guests to a show.D.Supervise preparations for an event.