The present invention relates to a rubber crawler including: a joint formed by joining together opposite ends of a crawler body comprising an elastic member shaped like a belt having the opposite ends; and lugs projected at predetermined space intervals along a longitudinal direction of the belt and arranged on an outer circumferential surface of the crawler body. Three of the end points are disposed adjacent to the substrate. 2 parts by volume relative to the unit volume of the refined vegetable oil. Numerous cards may be added to the timeline such that a user may scroll through the timeline to search for a specific card. The test adapter has, in an adapter housing, a peripheral edge for receiving a gas-measuring device and has a depression for receiving the sample liquid in the area of the gas-sensitive surface of the gas-measuring device.