<strong>Background:</strong> Varicocele is abnormal dilation and tortousity of the scrotal venous pampiniform plexus that drain blood from each testicle. Recent
Objective This study was designed to conduct a retrospective and systematic occupational health risk assessment(OHRA)of enterprises that used benzene,toluene,an
Aiming at the demand for optimization of hydrodynamic coefficients in submarines motion equations, an adaptive weight immune genetic algorithm was proposed to o