英语作业3由刀豆文库小编整理，希望给你工作、学习、生活带来方便，猜你可能喜欢“英语3在线作业”。
Pure oxygen must be given to patients in certain circumstances.Pipes are often corroded by the oxygen in the air.These problems must be solved before the test starts.Isolated columns or stanchions are normally supported on square concrete foundation bases.Account should be taken of the low melting point of this substance.Heat and light can be given off by this chemical change.Many kinds of metals have been developed to resist corrosion.Wounds can be cauterized by searing.Damage from the increased use of chemicals has been felt.The fuel must be tested to determine its suitability before application.
