A spray system has a base plate, a support member, a first cylinder mechanism and a second cylinder mechanism, a first slide tube and a second slide tube, a first board portion and a second board portion, a first holding bar, and a second holding bar. The method includes receiving a message transmission request carrying message content to be transmitted; generating a message conversion charging ID if the message content is to be converted; sending charging information carrying the message conversion charging ID and performing charging control on the message sender based on the message conversion charging ID. Such cleaning composition overcomes the intrinsic deficiency of SCCO2 as a cleaning reagent, viz. A first gate structure of a first fermi level is provided adjacent the first body edge. The behavior of the cruise control of a vehicle can be adapted to take account of economy, which makes it possible to optimize the fuel consumption of the vehicle.