本次试验纺制的空芯纱中空部分定型较差，不能耐多次洗涤。
The hollow center of the yarn produced in this experiment has a poor fixation.
空分装置的安全运行是工业制氧安全生产的关键环节，也是最难控制的危险源。
Operation safety of the air separation unit is the key link in the production of oxygen, which is a risk source of most difficult to control.
空分装置的安全运行是工业制氧安全生产的关键环节，也是最难控制的危险源。
Operation safety of the air separation unit is the key link in the production of oxygen, which is a risk source of most difficult to control.
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