原用重铬酸钾、NL防锈油防止内燃机车的缸套、冷却系统的腐蚀，但毒性大，效果不佳。
The potassium dichromate and NL antirust oil which were used to prevent the cylinder and cooling system of diesel locomotive from corrosion are not good enough and have toxicity.
原用重铬酸钾、NL防锈油防止内燃机车的缸套、冷却系统的腐蚀，但毒性大，效果不佳。
The potassium dichromate and NL antirust oil which were used to prevent the cylinder and cooling system of diesel locomotive from corrosion are not good enough and have toxicity.
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