Expound magnesium metallurgy with ferrosilicon process and calcium metallurgy with aluminothermic process by contracting technological conditions.通过工艺条件对比分析,阐明了硅热法炼镁与铝热法炼钙两者工艺过程、设备条件基本相同.Widely used in industry of machin...
The troops were severely mauled and lost a quarter of their strength before evacuating the island.部队遭到重创，从岛上撤退前损失了四分之一的兵力。The solution is degassed by alternately freezing, evacuating and thawing.通过交替的冻结 、 抽空和溶化来使溶液除气.Fir...
The foxes play havoc with the wildfowl.狐狸把那里的野鸟可折腾坏了.This was , until a few years ago, a wonderful wetland, teeming with wader and wildfowl.这个公园几年前还是一块美妙的湿地, 到处是涉禽和野禽.The International Wildfowl Research Bureau watches ov...