人工后牙需要排在牙槽嵴顶上,其说法错误的是()
A.使力直接传递于牙槽嵴顶
B.有利于义齿的稳定性
C.减少牙槽骨的吸收
D.可以方便排牙
E.预防义齿基托发生折断
参考答案:D
本例病人可能发生的脑疝是()
A.脑中心疝
B.小脑幕切迹疝
C.小脑幕切迹上疝
D.枕骨大孔疝
E.大脑镰疝
—Where ____ Margaret have put the empty bottles?
—She ______ them away. They must be somewhere.
A.can; can’t have thrown
B.must; needn’t
C.must; must have thrown
D.can; must throw