由於地下儲氣窖位於地表下,其地面上之設備僅佔總面積的1%,因此用於儲存天然氣,不僅最安全且不會衝擊地面上周遭之環境。
「離子交換膜法」,是將海水中的氯化鈉經離子交換電透析裝置形成鹵水,再經由多效蒸煮罐製成鹽結晶的製鹽方式。其優點在於鹽產品質優良、不受天氣影響,又可自動化生產而節省製鹽用地與操作人員的成本,但是因為能源成本頗高,導致整體成本仍無法與天日鹽抗衡,因此無法大量生產工業用鹽。
typically found in high traffic areas such as alongside busy roads.
A billboard (sometimes also called a hoarding in the UK and many other parts of the world) is a large outdoor advertising structure (a billing board),