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