View more than 200 years after Yongqing, Bingxian disasters, rain erosion, temples verge of left leaning.
永清观历经200余年, 兵燹灾害, 风雨剥蚀, 殿宇濒临倾颓.
互联网
The new rain erosion resistant aircraft coatings is a fluoro resin modified polyurethane coatings.
本研究的目的是研制一种新型航空玻璃钢结构部件用防雨蚀弹性聚氨酯涂料.
互联网