The present invention provides a cementing system and method for wellbores by cementing an annulus between a wellbore casing and a wellbore. The first agitator includes a body for bending and swinging in a bending direction perpendicular to an axial direction of the conveyance member, and a protrusion for protruding from the body in a protrusion direction opposite the bending direction of the body. The complexes may comprise nucleotide constructs which are comprised of promoters which are selectively and exclusively activated in the environment of an angiogenic endothelial cell. The scroll compressor may also include a back pressure chamber assembly fastened to the second scroll with a Efastener, a back pressure discharge opening that communicates with the back pressure chamber, and a discharge path by which the discharge chamber and the discharge space communicate with each other. After several retries further retries will be blocked and the call will only be set-up when the second subscriber station becomes free. The resulting tantalum nitride film has a low resistance, low contents of C and N atoms, and a high compositional ratio: TaN, show sufficiently high adherence to Cu film and can thus be useful as a barrier film.