Ⅰ. INTRODUCTION
In fourth semester most of our department students attend the subject of mechanical manufacturing practice and we have made a bolt by ourselves. But the process was not a soft job. A bolt and nut is used diversely but it seemed that we don't know much about a importance and manufacture of bolts.
A bolt is a threaded fastener used in industry to make two or more mechanical
(1) 물질 사용 장애
① 물질 의존
물질 의존이란 약물을 만성적으로 반복 투여하다 보면 내성이 생기고, 그 후 중단했을 때 그 약물에 특이한 금단증상 즉 생리적 및 행동적 장애가 나타나는 상태를 말한다. 의존 이란 중독이나 습관성을 통틀어 이들을 대신하는 잘 정의된 개념이다. 내성은 있을 수도
Introduction
"..... since I arrived in Washington. This city, unlike any other place I've lived, is a haven for the metrosexual. A metrosexual, in case you didn't catch any of several newspaper articles about this developing phenomenon (or the recent "South Park" episode on Comedy Central), is a straight man who styles his hair using three different products (and actually calls them "products"