document.write( ' <p><b>上一篇：</b><a href="../News/120031.html">PAC加药泵六种不同PAC之间紧密联系...</a></p><p><b>下一篇：</b><a href="../News/115042.html">隔膜式计量泵的工作原理和常见故障...</a></p> ')