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二，要求
1、引言部分
總的要求是：The purpose of an introduction is to Ping the reader into the general area of your study and then state the specific area of study (move from the general to the specific). The introduction shows the scope of your investigation efforts.** 即：說明研究的總體范圍和目的。
具體內(nèi)容包括：醫(yī)學(xué)全在.線payment-defi.com
A 背景–說明所研究問題的目前總體情況或歷史（statement of general area or history of problem);
B 意義–說明研究的意義或必要性（statement of importance or need);
C 進展–說明有關(guān)該問題的先有發(fā)現(xiàn)、報告或研究（statement of previous findings, reports or studies)。陳述這部分內(nèi)容時一般要有引文（citations);
D 目的–說明本研究的目的（statement of purpose of current study);
E 范圍–說明要研究問題的具體范圍（statement of specific area of problem to be studied)
