绝大多数种类以吃螺为生。Most species live off aquatic snails.它展现了螺杆泵采油系统在高粘稠油和出砂井等方面良好的应用前景。It shows good application future in high viscid oil wells and sand product.涡轮喷气发动机和涡轮螺桨发动机更适用于飞机.The turbojet and the turboprop are much mor...
将这张校样重新涂以重铬酸盐乳剂.The proof is recoated with dichromate emulsion.是光敏树脂 、 感光乳剂 、 合成树脂的良好稳定剂.It is the good stabilizer of photosensitive resin, sensitive emulsion, synthetic resin.介绍了可能用于脱环烷酸的中和剂 、 破乳剂及表面活性剂.Some neutralizat...
塞卢奎地区的所有前沙姆凡岩石均分布于此推覆体的倒转翼中.All the pre - Shamvaian rocks in the Selukwe area lie on the inverted limb of this fold.新集矿区是从推覆体下采煤.Coal is mined under nappe in Xinji Mine area.新集二矿在特定推覆体水体下的煤层开采, 13-1 煤开采水文地质条件尤为复杂.Coal Mi...