A package substrate for improving electrical performance includes at least an insulating layer, a wiring layer and a groundpower layer. The structural member, made of plastics material, moulded on the metal cross-member, has a passage forming an air duct. The persisted output object of the computer software application, when so complemented by the inserted advertisements, is hereby termed a \u201cmagazine\u201d. Thus, the invention allows for production and recovery of C3-C6 alcohols at low capital and reduced operating costs. By such arrangements, this crank arm remover will be operable to assemble and disassemble the crank arm of different sizes.