A fuel cell stack includes cell units stacked on one another and each including a membrane electrode assembly and two separators defining gas passages on both sides of the membrane electrode assembly, a cooling fluid passage for flowing a cooling fluid provided between the separators of each adjacent two of the cell units, and a displacement absorber provided in the cooling fluid passage. After the damage is detected, a digital image of the is obtained. One or more specific identifiers are derived based upon the core identifier, wherein the specific identifiers serve as addressing information to the respective communication modes. A second band in each servo sector is spaced along-the-track from the first band and also has two patterns like those in the first band, but with the phase shift of the second pattern being in the opposite direction to the phase shift of the second pattern in the first band. The anti-temper sensor undergoes individual and integrated sensor processing procedures; whereas, the integrated sensor processing procedure determines a container alert status. The safety device includes a shear pin, a clamping piece and a securing element, wherein the shear pin is arranged in a corresponding bore in the turbine blade foot and the clamping piece is designed having an upper limb and a lower limb, wherein the clamping piece exerts a radial force on the turbine blade foot for radial safeguarding.