Those things were not produced ____long after he died.A.before B.when C.since D.until

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• Those things were not produced ____long after he died.A.before B.when C.since D.until选什么,同求翻译这句话,
• Those things were not produced ____long after he died.A.before B.when C.since D.until
• The bicycle is one of the simplest but most useful inventions in the world.What is most surprising is that it was not _36___early,although the great inventor Leonardo da Vinci had drawn pictures for bicycles and also for flying machines and some other things.Those things were not produced_37___long after he died.A person riding a bike uses __38__energy（能源） to make the bicycle move ,and there is no pollution at all when you are riding.Even so,in develo
• 如图，AC⊥BC，AC=9，BC=12，AB=15． （1）试说出点A到直线BC的距离；点B到直线AC的距离； （2）点C到直线AB的距离是多少？你是怎样求得的？
• 求一道高一基本不等式题目.