Abstract: An intelligent oil extraction system using an all-metal screw pump includes: the all-metal screw pump, an oil collecting unit (43), and a steam generating unit (45); wherein an internal threaded curve surface and an external threaded curve surface of the all-metal screw pump are both tapered spiral structures with equal tapers; the oil extraction system comprises a lifting mechanism and monitoring and control mechanism; the monitoring and control mechanism comprises: a controller (34), a torque sensor (35), a flow sensor (36), a pressure sensor (39), a liquid level detector (38), and a backup power source (37); the controller (34) is electrically connected to the torque sensor (35), the flow sensor (36), the pressure sensor (39), the liquid level detector (38), the backup power source (37), a drive motor (48), a servo motor (33), a first valve and a second valve.

Abstract: It is disclosed a method for simultaneous detection of multiple tumor markers, comprising the steps of: (a) mixing analyte samples, a first antibody solution and a second antibody solution, thereby forming a quaternary composite of “Second Antibody-Tumor Marker-First Antibody-bead”; (b) detecting the detectable signals from the distinct beads of the quaternary composites to determine the presence of each tumor marker in the analyte sample. The method of invention can simultaneously detect multiple tumor markers qualitatively or quantitatively. It is also simple, rapid and accurate. The invention also provides the corresponding assay kit.