pH-valueBNC²³⁶²¹³⁺¹ 基本例句 氢离子浓度负对数值¹⁰⁰ Automatic control of pH-value has not been solved appropriately. As a new generic serial buses standard, the application of USB is more and more widely used. USB作为一种新的通用串行总线标准,具有较强的纠错能力、速度快、不占用系统资源、方便灵活等特点,应用越来越广泛。 fabiao