高一數(shù)學(xué)輔導(dǎo)同步課
主講老師:黃穎 、馮海君、王老師、王晨等
特色服務(wù):互動(dòng)封閉仿真課堂啟發(fā)式教學(xué)方式智能錯(cuò)題本在線答疑
免費(fèi)試聽
互動(dòng)封閉仿真課堂
1、智能交互 2、電子板書式視頻教學(xué) 3、在線互動(dòng)問答 4、封閉課堂啟發(fā)式教學(xué)方式
隨堂測(cè)試、知識(shí)梳理、易錯(cuò)點(diǎn)揭示、總結(jié)啟迪智能錯(cuò)題本
聽課中的錯(cuò)題能自動(dòng)加入錯(cuò)題本,課后可方便復(fù)習(xí)及導(dǎo)出錯(cuò)題本升級(jí)服務(wù)
在線答疑、課后同類題練習(xí)、講義下載、短信提醒THE GREAT PYRAMID
It's very hard to realize just how big the Great Pyramid is. It has over 2 300 000 blocks of solid stone. These huge stone blocks weigh an average of two and a half tons each, as much as a small car. Some even weigh fifteen tons. Without machinery, the ancient Egyptians cut and moved and lifted each of these stones. The blocks came from the east bank of the Nile. Slaves took them across the Nile in boats at flood time. It took more than 100 000 slaves twenty years to build the Great Pyramid.
The Great Pyramid is over 450 feet high today, and it was once higher. Its base covers thirteen acres. Each of the sides of the pyramid is 755 feet long, or about as long as two city blocks. It takes about twenty minutes to walk all the way around the pyramid.