A game of deduction including game components and rules for playing a game for a plurality of players, a goal of which may be for one player to deduce, through a question and answer process, an image on a game card chosen by another player. More particularly, the catalyst for glycerin dehydration prepared by the preparation method is able to minimize by-product formation to improve acrolein selectivity and to maintain high catalytic activity during the reaction. Thus, the piston ring is wrapped by a skin with a progressive structure having a gradient distribution of hardness. The second supporting member is rotatably connected to the fixed base and is slidably connected to the first supporting member. The voltage regulator receives the control signal from the control chip through the first and second GPIO buses and regulates power supply modes, to output different phase voltages to the memory modules mounted in the memory slots.