Test center tracking synchronous training Chemistry Grade 9 20 16 Shenzhen Special Edition

Daily operation: new users log in for the first time +20+20 to complete account activation; Daily login +2 only adds points for the first login every day; Submit the answer +2 and get up to 20 points every day; The answer is adopted as the best answer +20+ reward points +20+ reward points; The answer is adopted by the questioner as the best answer or selected as the best answer by voting. ....