Compositions and methods for determining the presence or concentration of glucose in a sample which may also contain an alpha-hydroxy acid or a beta-diketone. The general public line has multiple networks including a high-speed digital network for transmitting large quantities of information from the elevating machine to the center and a low-communication-cost public network for transmitting a control command from the center to the elevating machine. In one embodiment, gating signals from at least two active wireless transceivers may be detected. Further, the gas vent hole 7 is formed as a slender opening stretched in the direction which is displaced by a predetermined angle from the d axis.