double case中文什么意思

• 快药

• double:    adj. 1.两倍的，加倍的。 2. ...
• case:    n. 1.箱，盒。 2.鞘，袋，套子 ...
• double case construction:    双层包箱

例句与用法

1. Double case construction fuel tank
   双层包箱
2. This device has many advantage character with lower flow , higher delivery lift , small area for occupying and also has double cases structure , in which internal case is vertical and sectional type and external is simple sack type in order to guarantee safety arriving without any leaking absolutely
   该型泵具有流量小、扬程高，占地面积小的优点，该泵为双层壳体结构，内壳为立式节段式，外壳为筒袋式，确保运行安全，达到绝对无泄漏。