If the bearing is in a good state of continuous rotation will be issued a low whining sound. Squeaking sizzles, squeaks, and other irregular sounds often indicate poor bearing continuity. Sharp creak noise may be caused by improper lubrication. Improper bearing clearance can also cause metal noise. The dents in the concave track on the bearing outer ring track can cause vibration and create a smooth and crisp sound. If it is caused by the installation of the percussion scars will produce noise, the noise will vary with the level of bearing speed. If there is intermittent noises, then the rolling elements may be damaged. This sound occurs when the damaged surface is rolled out of the way, bearing contaminants often cause a hissing tone. Serious damage to the same bearing will produce irregular and huge noise.
Saturated steam sterilization is a common physical means of killing organisms, because high temperature has an obvious lethal effect on bacteria. High temperature denaturation and coagulation of bacteria, enzyme loss of activity, so that the death of bacteria.
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