急问：毕业证和学位证证明要封在信封里面么？？？？？？

ruti

中间盖个骑缝章就可以了，还是要像成绩单一样用信封封起来？？？？？？？？

If school doesn't specify, you may seal them in an envelope and sign (or stamp) on the seal.

Put your name and indicate the type of document (degree certificate...) on the envelope to assist the admission procedure.