摘 要：常减压蒸馏装置增设原油轻烃回收工艺，采用压缩机输送回收工艺，将常、减顶不凝气送轻烃回收轻烃。每年回收常顶不凝气6000吨.其......

【概念】 　　一般现在时通常表示经常、反复发生的动作或行为，以及目前的特征或状态。与它连用的常见的时间状语有：always, usually......

1. The otter often shows off his abilities, ＂I have seven abilities. I can pretend to be dead; I can swim; I can…”水獭......

Jostein Gaarder（born 8 August 1952 in Oslo）（奥斯陆,挪威首都）is a Norwegian intellectual and author of several novels,short s......