简述影响种子萌发的条件?
参考答案:
(1)内部条件:①种子的休眠;②种子的成熟度;③种子的寿命。
(2)外部条件:①适当的水分;②适宜的温度;③充足的氧气
患者,女,前牙内倾性深覆,为变色牙,需进行PFM全冠修复,牙体制备后发现舌侧空间只有0.5mm,技师在制作时金-瓷衔接线的位置应为()
A.距基牙舌侧颈缘0.5mm
B.距基牙舌侧颈缘1.0mm
C.舌侧采用金属板形式,瓷层只覆盖至舌侧缘2~3mm处
D.舌1/2处
E.颈缘处
Near the table ________ a poor dog, who desired to satisfy his hunger with something _________ fell
from the table.[ ]
A. laid; which
B. lay ; that
C. laid ; that
D. lay ; what