piazza.com
Piazza is a free online gathering place where students can ask, answer, and explore 24/7, under the guidance of their instructors. Students as well as instructors can answer questions, fueling a healthy, collaborative discussion.
язык: fa-IR владелец: Piazza связи: 221 Alexa: 21 452 Веб безопасности: 95% Page Rank: 6 дата: 04.02.2014