单词:oxygen-acetylene flame spraying coating
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Well, that's limelight. What exactly was it? Well it was the burning of calcium oxide in a very intense flame. And when did the job of a limelighter begin? Oh, famously, the first recorded instance in
图片1 aerial n.天线 例句:The picture is much clearer with the new aerial. 装上新天线后画面清晰多了。 nitrogen n.氮 例句:Air consists chiefly of nitrogen. 空气主要由氮气组成。 oxygen n.氧 例句:Trees relea
Dallas Continues Spraying in Fight Against West Nile Fever Many people in Dallas continue to work and play outdoors, but they are heeding warnings from health officials to protect themselves. Fifteen-year-old Macias says he has followed the news repo
Spraying Insecticide Indoors Reduces Spread of Malaria Researchers in West Africa have shown that spraying insecticide indoors can dramatically reduce malaria transmission. Efforts to develop a malaria vaccine have so far been disappointing, so progr
DALLAS Officials in Dallas, Texas and the surrounding county of the same name are continuing to spray by land and air in an effort to suppress mosquitoes that spread the West Nile virus. Health officials have reported more than 200 cases of fever cau
As Uganda looks to eliminate malaria, the country is engaged in a debate(辩论会) over the use of chemicals such as DDT in some of the world's most malarial regions. In the district of Apac in northern Uganda, the risk of malaria is higher than any