선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
AI-Helper
The study presents the extended realms of application on polyurethane; 1)to make the hair cracked part around door & window frame sealed up, which often occures by over and over variations of shrinkage and dehydration according to time elapsing until it becomes stable, no more proceeding, 2)to prevent sound & vibration from transmitting to the neighbore, which often becomes the controversial issue on annoyance of noise, such as tapping, walking, showering, door clapping, quarraling, and 3)to change the already prevailing wood form with polyurethane material that is expected superior in many respects, and wood form has some kinds of disadvantages such as safety in working, work-place movement, efficiency, productivity, 3D tendancy, and etc.,
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