The present invention provides a method of isolating a selected reservoir zone in a subterranean reservoir comprising at least the step of squeezing a treatment fluid into the selected reservoir zone, the treatment fluid comprising: a viscosifying agent; a fluid loss control agent; and a particulate material. A dual weight balancing arrangement includes oppositely extending weights in planes spaced above a sanding pad to completely balance the eccentric rotary pad with the separately located weights. One terminal of the first asymmetric meander line is connected with the signal feeding part, the other terminal is connected with the ground part, and the first asymmetric meander line does not meander toward its inner side. Since carriers may easily recombine at the grain boundaries of polysilicon, eddy current generated on a surface of the high resistivity silicon base is reduced, loss of the RF signal is reduced, and linearity of the RF signal device is improved. At least one of the links is selectively mountable in at least two configurations relative to its adjacent links. By monitoring the presence status of the user, the agent may act as a proxy for the user when the user becomes inactive.