| abstract |
Some embodiments relate to a kind of clamp, including: base portion；The first and second relative arms, described first and second arms are connected with described base portion；And the first and second relative chelas, described the first and second relative chelas are connected with the first and second arms respectively, and are respectively provided with the part that extends internally, described in extend internally and partly extend towards described base portion；Wherein, the most described base portion is by marmem, and when the temperature of described base portion meets or exceeds the phase transition temperature of described base portion, described marmem tends towards and orders about described first and second arms each other. |