درس 3: Renewable Energy
زبان انگلیسی (3)
دوازدهم
دوره دوم متوسطه- نظری
ادبیات و علوم انسانی
درسنامه آموزشی این مبحث
The goal is to create something the size of a ......................... battery, holding only about 30 percent as much energy, but able to charge or discharge in two seconds, almost forever.