酸液有效作用距离是指酸液由活酸变为()之前所流经裂缝的距离。 鲜酸。 残酸。 活性酸。 压裂液。
It is essential for()to give a complete description of damage and shortage in the discharging report. the office staff。 the terminal staff。 the ship's crew。 the insurance company。
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。
管道与设备、阀门螺纹连接应(),不得用管接头强力对口。
韧皮部卸出是指什么?
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()