单项选择题
银汞合金充填后，患牙需等待多久后才能咀嚼A、3h B、6h C、12h D、24h E、48h
单项选择题银汞合金充填后，患牙需等待多久后才能咀嚼A、3h B、6h C、12h D、24h E、48h
Which festival is truly China's Valentine's Day in anci...
单项选择题Which festival is truly China's Valentine's Day in ancient times? A、The Lantern Festival B、The Double Seventh Festival C、The Mid-autumn Festival D、The Spring Festival
Speech is verbal communication so it does not contain n...
单项选择题Speech is verbal communication so it does not contain nonverbal elements. A、正确 B、错误
