A hydraulic circuit having a holding valve of an external pilot pressure operation type is provided, which can make a double check valve, which is installed to prevent an actuator from being pushed due to leakage of hydraulic fluid of a main control valve, be opened by an external signal pressure being supplied to shift the main control valve. The main suspension member 10 includes a main portion 12 constituted by a pipe; two body-side attachment portions 14, 16 that are fixed to opposite ends of the main portion 12, respectively; and a wheel-side attachment portion 18 that is fixed to a rear-side portion of the main portion 12. The EPDM comprises greater than 60 wt % units derived from ethylene. The first and second portions are configured to electrically generate a plasma between the workpiece support and the plasma electrode. Initially, two or more of the parallel instruction paths processes the same program thread through the execution units, but with different optimization characteristics set for each path. The brightness enhancement film of the present invention can be used in liquid crystal displays as a light diffusion brightness enhancement film.