[填空题] 管道与设备、阀门螺纹连接应（），不得用管接头强力对口。

Condensate must be drained from the intercooler and after-coolers of an air compressor because （）. ["the cooling effect of the condensate reduces the compressors efficiency","a danger of explosion exists whenever water is present in a compressor","water causes erratic operation of pneumatic components","the volumetric capacity of the first stage is reduced if water remai"] 哪一种形态的结构为动物细胞产能的主要地方？（） ["","","",""] 在酸液中加入稠化剂的目的是为了使酸液变为残酸前能有效地防止酸液（） ["滤失","扩散","进入地层","加快反应"] 酸压和水力压裂增产的基本原理和目的都是相同的，主要差别在于酸压一般不使用（） ["携砂液","前置液","支撑剂","顶替液"] Excel中，如果删除某单元格后，希望右侧单元格左移或下方单元格上移，应执行菜单的（）操作。 ["编辑→清除→全部","编辑→剪切","编辑→清除→格式","编辑→删除"] 管道与设备、阀门螺纹连接应（），不得用管接头强力对口。