【摘 要】
：
酸度计是学校、厂矿及研究部门实验室中的常规分析仪器,用于测量溶液的ｐＨ值和ｍＶ电势。早期的型号有ｐＨｓ-2、ｐＨｓ-29等,采用变容二极管作调制元件构成前置级,以满足玻璃电极对输入阻抗的运
【机 构】
：
山西省长治市计量测试所!山西长治046011,山西省长治市计量测试所!山西长治046011,山西省长治市计量测试所!山西长治046011
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酸度计是学校、厂矿及研究部门实验室中的常规分析仪器,用于测量溶液的ｐＨ值和ｍＶ电势。早期的型号有ｐＨｓ-2、ｐＨｓ-29等,采用变容二极管作调制元件构成前置级,以满足玻璃电极对输入阻抗的运算放大器ＡＤ515Ｊ担任阻抗变换,由3位半数字电压表显示直流毫伏电势和ｐＨ值。仪
The pH meter is a routine analysis instrument in the laboratory of schools, factories, mines, and research departments to measure the pH and mV potential of a solution. Early models were pHs-2, pHs-29, etc., and varactors were used as the modulating elements to form the pre-stage to meet the input impedance of the glass electrode to the AD515J operational amplifier as an impedance conversion, and a 3-digit half-voltage meter was used to display the DC voltage. Volt potential and pH. instrument
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目的 研究脉络宁口服液的安全性。方法 采用半数致死量试验、最大给药量试验及长期毒性试验。结果 脉络宁口服液毒性极低 ,未能测出小鼠LD50 ;小鼠一日最大给药量为 16 7g
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Once upon a time， there was a hungry fox that was looking for something to eat. He was very hungry. 1. No matter how hard he tried， the fox could not find food. Finally he went to the edge of the fore
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