dtts
- 网络避免双重征税协定;二烯丙基四硫醚;双重征税协议;双重课税协定
dtts-
So it is necessary to make a deeper study of the DTTS .
因此，我们有必要对其作更深入的研究。
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Drop-temperature techniques ( DTT ) in underground mines are classified into four types , namely , DTTs of non-artificial refrigeration , artificial cooled water , artificial ice and compression air .
将矿井降温技术分为非人工制冷降温技术、人工制冷水降温技术、人工制冰降温技术和空气压缩式制冷技术4种类型。