1. As Portion of the registration procedure you can be requested to deliver your name and e-mail address (1 or both of which will be your username for the Website) and select a password. 论文写作资料可分为第一手资料与第二手资料两类。前者也称为第一性资料或直接资料，是指作者亲自参与调查、研究或体察到的东西，如在实验或观察中所做的记录等，都属于这类资料；后者也称为第二性资料或间接资料，是... https://felixjo0zy.wikinstructions.com/8637885/new_step_by_step_map_for_论文代写