The present invention relates to information security field and presents a method for searching for a class and a function based on a. The mechanism includes push-pull rods to effect movement of throttle levers on motors that independently drive traction elements such as wheels or traction belts. The control device may have a first sensor for determining a first adjustment position of the first window lifter, and a second sensor for determining a second adjustment position of the second window lifter, the first sensor and the second sensor being based on different physical operational principles. This structure allows a single mounting apparatus to perform both die bonding and flip-chip bonding. The buyer interface is stored in the network platform for the buyers to connect for choosing the number of the corresponding units of to-buy commodity.