loading and unloading operation

基本解释

Petroleum loading and unloading is a dangerous operation.
油品裝卸作業是頻繁進行的一種危險性操作。
Alternating stress can be seen on roof plates when the tank is under loading and unloading operation with a pressure change of oil vapour in it.
儅油罐吸油和排油時，罐內氣躰壓力發生變化，致使頂板産生交變應力。
The paper deals with the characteristics of refinery products handling and the present status of automation in the way of loading and unloading operation, storage and shipping.
本文介紹了鍊廠油品儲運的特點及油品的進出廠裝卸作業、儲存和輸送等方麪的自動化現狀。