PEM
target: 聚电解质
description: polyelectrolyte
target: 質子交換膜
description: Proton-exchange membrane
target: 蛋白質熱量營養不良
description: Protein–calorie malnutrition
target: Pem格式
description: Privacy-Enhanced Mail
target: X.509
description: 的隐私增强型电子邮件格式扩展名
target: PCI Express
description: Mini
target: 电源输入模块
description: power entry module