Of course, the method is limited by environmental factor and precision of instrument when used in practice.
当然，这一方法在实践中的运用还会受到环境因素、仪器精度等的限制。
2
Life cycle assessment technique is verified as an instrument of environmental symbol products in many countries.
生命周期评价技术被许多国家作为认证环境标志产品的工具。
3
Being Reference Materials, they are chiefly applied of work standards in instrument calibration, method opinion or arbitration of chemical and environmental analysis.