Precision bearings according to ISO grading standards are divided into: P0, P6, P5, P4, P2. Rank higher in turn, where P0 is the general accuracy, other grades are precision level. Of course, different classification standards, different types of bearings, their classification method somewhat different, but the meaning is to the. The use of performance requirements of precision bearings rotating body with high runout accuracy, high-speed rotation and small changes in friction and friction.
2013年7月26日星期五
Ministry of Health to strengthen supervision and monitoring of drinking water guidance
Provinces, autonomous regions and municipalities health bureau of Xinjiang Production and Construction Corps, Health Bureau, the Chinese Center for Disease Control, Ministry of Health Supervision Center:
Safe drinking water is an important foundation for the protection of public health, relationships, happiness of each family. In recent years, the health sector at all levels perform their duties according to law, and actively take measures to protect the health and safety of drinking water, together with relevant departments have done a lot of fruitful work, urban and rural drinking water safety conditions have been greatly improved. But it should be noted that the current and future health and safety of drinking water situation is still very grim, drinking water monitoring capabilities lag, protection is not in place, coordination mechanisms and related systems need to be improved, supervision and monitoring efforts need to increase. To strengthen supervision and monitoring of drinking water, protect the people's health and safety, are the following guidance.
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