Physical property test of machine pick up cotton and compare to manual pick up cotton is done.
对机采棉进行了物理性能测试，并与人工采棉进行了比较。
Good knowledge of the chemical and physical property and the test method.
掌握良好的化学和物理性能知识及测试方法？
Good knowledge of the chemical and physical property and the test method.
掌握良好的化学和物理性能知识及测试方法？
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