通过试验和理论分析厚、扁螺母在紧固过程中的受力情况，并从试验结果得到一个较合理的厚螺母拧紧力矩，既能保证塔式起重机的安全运行，又能延长螺栓的使用寿命。
Changing the positions of thin and thick nuts and using the right thick nut tightening torque ensure safe operation of the crane and longer lives of the screws.
所有的螺母和螺栓要安全拧紧，割草机必须存放在一个能确保其安全运转的环境中。
All nuts and bolts must be tightened securely and the mower must be kept in a condition ensuring its safe operation.
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