직선형선

Straight Lined Vessel

직열용접

Series Welding

직열흐름터빈

Series Flow Turbine

직장

Foreman

직재

Straight Timber

직접강도계산

Direct Strength Calculation

직접역전장치

Direct Reversing Gear

진공계

Vacuum Gauge

진공관

Vacuum Tube, Vacuum Valve

진공차단기

Vacuum Breaker