Orientation control of primary carbide in Fe - Cr - C hardfacing alloys.Fe -Cr-C 耐磨堆焊合金中初生碳化物生长方向的控制.A hardfacing electrode containing boron and various alloy elements has been developed.研制出一种含硼等多种合金元素的耐高温磨损堆焊焊条.Study of...
Water tanks should be well lagged and the roof well insulated.水箱和屋顶都需要敷设严密的保温层。Are your hot and cold water pipes well insulated?你们的冷热水管包好隔热层了吗？This room is insulated against noise.这个房间隔音....
He has on a denim shirt with a T-shirt underneath.他穿了一件牛仔衬衫,里面套了件T恤.Jeans, the all-purpose denim trousers, have been around for over a hundred years.牛仔裤，这种适合各种用途的斜纹粗棉布裤子，已经有一百多年历史了。Dennis was dressed in denim jeans.丹尼斯穿了...
N - hydroxyethylpyrrolidone ( NHP ) was synthesized from � � - butyrolactone and ethanolamine on Y molecular sieve catalyst by two steps.以改性Y分子筛为催化剂,γ-丁内酯和乙醇胺为原料,采用γ - 丁内酯法两步合成N - 羟乙基吡咯烷酮 ( NHP ).Surface active propertie...