There are three main problems in the traditional chemical pulping: high cost and energy consumption, low pulp yield and serious environmental pollution.
传统化学制浆工艺主要存在三个问题，即成本、能耗高，纸浆得率低，环境污染严重。
The calculation of orifice, balance calculation of system parameters and analysis of turbine performances are the three main problems met in the test of turbo-pump linkage.
节流圈计算、系统调整计算和涡轮特性分析是涡轮泵联动试验中的三个主要问题。
The intensity of concrete, progress of construction and free traffic are three main problems for board updating construction, especially in highway with large traffic volume.
混凝土强度、施工进度、车辆畅通是换板施工的三个主要问题，在交通量大的公路上更是如此。
The intensity of concrete, progress of construction and free traffic are three main problems for board updating construction, especially in highway with large traffic volume.
混凝土强度、施工进度、车辆畅通是换板施工的三个主要问题，在交通量大的公路上更是如此。
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