엘보

Elbow

여객선

Passenger Boat

여객설비

Passenger Accommodation

여객안전증서

Passenger Ship Safety Certificate

여과기

Strainer, Strrm Box, Rose Box

여닫이문

Hinged Door

역극성

Reversed Polarity

역극성 용접

Reverse Polarity Welding

역나선형조종시험

Reverse Spiral Maneuvering Test

역류열교환기

Counterfiow Heat Exchnger