Changing or cutting the impeller, adjusting the angles of variable blades, changing the angles of pressure expander and variable speed of fans may be adopted for the energy-saving of fans on hand.
对现有风机节能改造可采用更换或切削叶轮、调整可调叶片角度，改变扩压器叶片角度以及风机变速运行等措施。
The cannula and the expander can be easily combined together or separated from each other.
套管和扩张器能够方便地组合在一起或彼此分离。
BW rubber expander glue bond substitutes for stepped joint or tongued and grooved joint in the horizontal joint site on the outside wall of basement.
在地下室外墙施工中 ，铺设BW温水膨胀橡胶止水条 ，取代了水平接缝处留阶梯缝或凸凹缝的作法 ；
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