Most diaphragm pumps have check valves built-in.
好多的隔膜泵都内置单向阀。
Built-in optical system and adjustable iris diaphragm with clear image.
内置式显微光学系统及光栏，像质清晰。
The civil works of Shanghai metro No. 1 line was completed in spring of 1994. The metro stations are mainly built by diaphragm wall .
上海地铁1号线区间隧道采用盾构法施工，地下车站采用地下连续墙法施工，其土木工程已于1994年春全线竣工。
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