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1·Examine the pressure meter tube and valve, pressure meter cover glass, if it is dirty, clean it with diluted hydrochloric acid.

检查压力表管道及阀门是否畅通，灵活，压力表面玻璃如有污，可用稀盐酸拭净。

2·The test results show that the method is feasible. The reclamation of diluted hydrochloric acid and oxalic acid can reach more than 95%.

经试验证明，采用该种方法处理草沉废水并将产生的稀盐酸和草酸回用于稀土生产是可行的。

3·The optimal scheme was ascertained as flows: alkaline wash-diluted hydrochloric acid activation-acidic copper plating-replacement silver plating.

确定了最佳方案：碱洗—稀盐酸活化—酸性镀铜—置换法镀银。

4·METHODS Used diluted hydrochloric acid as dissolvent, to ensure the disturbance degree of accessories and proof the feasibility of testing method.

方法试验采用稀盐酸做为溶出介质，依法确证辅料的干扰程度及含量测定方法的可行性。

5·A new spectrophotometric method for the determination of trace nitrite is studied. The method is based on the nitrosation reaction of xylene cyanol FF with nitrite in diluted hydrochloric acid medium.

研究了在稀盐酸介质中微量亚硝酸根与二甲苯蓝FF发生的亚硝化反应，建立了测定微量亚硝酸根的新方法。