The purpose of the present invention is to provide a dust collector, an electrode selection method for a dust collector, and a dust collection method such that it is possible to select a suitable wire mesh to be used in a collecting electrode and thereby improve the collecting efficiency even at high flow velocities. Each filter element can receive a liquid which is electrically conductive and X-ray absorbing, and is supplied via a transport channel, the X-ray absorptivity of each filter element being discretely adjustable by step-wise adjustment of the level of the liquid in each filter element. In a remoting system, a server may make its service available via multiple encoding, protocol and transport combinations. A channel quality indicator measurement value is corrected according to a BLER measurement value and the determined BLER target value. The pixel electrode is formed in the pixel area and coupled to the second transistor. This invention also relates to methods of treatment using a crystalline zilpaterol salt prepared in accordance with this invention to increase the rate of weight gain, improve feed efficiency, andor increase carcass leanness in livestock, poultry, and fish.