上颌牙列中牙周膜面积最小的是
A．4B．2C．1D．3E．5
参考答案：B
Ⅱ级土有壤土、淤泥、含根种植土，其开挖工具及方法为( )。
A．用镐、三齿耙等开挖
B．用铁锹，需用脚踩开挖
C．用铁锹或略加脚踩开挖
D．用镐、三齿耙开挖或用铁锹需用力加脚踩开挖
A 23-month-old child is brought to the emergency department with suspected croup. Which assessment finding reflects increasing respiratory distress
A．Intercostal retractions.
B．Bradycardia.
C．Decreased level of consciousness.
D．Flushed skin.
