A fuel injector mounting structure may employ a flat bottom, a first vertical wall that meets flat bottom, a second vertical wall that meets flat bottom, and a top wall. When an optical fiber preform is manufactured by the vapor-phase deposition method, the dehydrating treatment is performed on a porous core preform that is obtained by deposing glass microparticles. The information indicating how to transmit the channel state information report may be provided by the serving eNodeB. The plurality of weights may include a first weight, a second weight, a third weight, and a fourth weight that are all engaged with the striking face.