Paragraf Tamamlama 28. Soru

28.

In 1846, an Italian chemist named Asciano Sobrero produced the first nitro-glycerine. When he heated a drop of it, it produced a large explosion. ……. .Of course his noble gesture did no good at all. Other scientists followed up his research, and high explosives were being used in warfare by the end of the 19th century.