这项工程该收尾了.The remaining part of the project should be accomplished.这封信以乐观的口气收尾.The letter ended on a cheerful note.这个速度常常称为收尾速度.This velocity is often called the terminal velocity....
As I completed my 26th lap the Porsche puffed blue smoke.我跑了26圈时，保时捷车冒出了蓝烟。The shop charges up to $500 to tune up a Porsche.那家店调试一辆保时捷收费高达500美元。The Porsche 911 reminds me of the worst parts of the yuppie era.这辆保时捷911让我想起...
manganese peroxide二氧化锰The sample was molten and decomposed with sodium peroxide , leached and acidified hot water and - volumed.试样以过氧化钠熔融分解,热水浸取、酸化,定容.Explain why barium forms peroxide but beryllium does not.解释为什么钡能形成过氧化...