Aiming at the serious effect of coverage hole caused by the poor deployment environment and the limited energy of wireless sensor network (WSN) on network lifetime. an optimized and lightweight energy-efficient connected coverage heuristic (OECCH) algorithm is proposed. Armed with the analysis of the coverage contribution. the sensor nodes are categorized into sensing nodes and relay ... https://www.nacrack.com/flash-pick-7-5ft-Heavy-Duty-Gold-Metal-Round-Wedding-Arch-Photo-Backdrop-Stand-top-grab/