phenformin苯乙双胍,苯乙基二胍,降糖灵 phosphate-buffered iodine磷酸盐缓冲碘溶液 lead intoxication铅中毒 primary basilar impression原发性扁颅底,原发性扁后脑 penile-brachial index阴茎-肱(动脉收缩压)指数