How is a bridge built? Cement is mixed with water and rocks to make concrete. The concrete is poured into holes and into blocks that are stacked to make a bridge. Once fences and lights are added to the bridge, cars can drive across it.
لغة الأسبانية ● شكل PDF ● ISBN 9780822572022 ● الناشر Lerner Publishing Group ● نشرت 2006 ● للتحميل 3 مرات ● دقة EUR ● هوية شخصية 5846036 ● حماية النسخ Adobe DRM
يتطلب قارئ الكتاب الاليكتروني قادرة DRM