Copolymers containing acryloylmorpholine and vinylimidazole, and optionally vinylcaprolactam andor n-vinyl pyrrolidone, have shown superior results in hydrate inhibition tests at conditions of 7\xb0 C. In another aspect, the present invention relates to the combination of a marketing business with a membership buying opportunity using both electronic commerce and face-to-face transactions. A plurality of magnetic poles and a plurality of phases in each pair of poles are formed when currents flow through the windings. Each first connection mechanism includes a hook receptacle, which is arranged on the bass drum and open in a downward direction, and a hook, which is arranged on the carrier and inserted in the receptacle. When the program being viewedlistened to becomes unviewableunlistenable, the time during which program viewinglistening is interrupted can be shortened. An inner circuit is surrounded by a plurality of cells in which a first switch element for connecting a power supply voltage line or a ground voltage supply line to a power supply line of an internal circuit is disposed below power supply lines extending in a first and second directions, and the power lines are connected together.