单项选择题

对下颌第三磨牙描述不正确的是
A、为全口牙中形态、大小和位置变异较多者之一
B、牙合面5尖者似下颌第一磨牙，四尖者似下颌第二磨牙
C、牙冠各轴面光滑，颊面外形高点在牙冠颈1/3处
D、牙合面牙尖、嵴、窝不清晰，副沟多
E、牙根常融合成锥形，也有分叉成多根者

你可能感兴趣的试题

多项选择题

1，这首作品唱出了男女主人公怎样的情感？
A、A激情澎湃
B、B斗志昂扬
C、C委婉深情
D、D情意绵

单项选择题

Which of the following is NOT considered as a major driving force for water flow from the soil through the plant to the atmosphere?
A、Difference in water vapor concentration between leaf and air, responsible for the diffusion of water vapor from the leaf to the air.
B、Difference in hydrostatic pressure, responsible for the bulk flow of water through xylem.
C、Difference in water potential, responsible for the movement of water across the living cells in the roots.
D、Elevation of the plant.