It seemed to be made of grey metal, shiny but rough, like emery paper.
它看起来像是由灰白色金属制成，有光泽但很粗糙，质感如砂纸。
Bruising a grey or mottled effect, most noticeable in coated papers. It is a paper defect caused by undue heat or pressure in the calendars.
在粉纸上特别显著的灰色或斑点状情况。这是砑光机上的过度热力或压力所造成的纸张故障。
This paper inserts grey system, makes use of finite time series, follows GM (1, 1) building method, builds the long term prediction model of total waste -water in Heilongjiang Province.
本文引入灰色系统理论，利用有限的时间序列，按照GM(1,1)建模方法，建立起黑龙江省污水总量长期预测模型。
应用推荐