经多炉次试验，使组织达到正常，性能得到改善，使用寿命提高。
After many furnaces' test, normal structure is obtained, so properties are improved and used life is lengthened.
通过桥梁荷载试验可以实现或验证正常使用极限状态承载力。
The ultimate state of the bridge normal use can be practiced or tested by loading test.
理论分析和试验结果表明，采用变速切削加工时，电机瞬时电流确有一定程度的波动，但不影响机床电机的正常使用；
The theoretical analysis and experimental results demonstrate that the motor current has some fluctuation in vari-speed cutting process, but it is almost no effect on normal operation of machine tool.
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