关于口腔境界叙述中错误的是()
A.前界为上、下牙齿
B.后界为咽门
C.两界为颊
D.上界为腭
E.下界为舌下区
参考答案:A
听句子,缩写原文。()
A.I shall give you a discount.
B.The crisis is affecting the whole world.
C.I shall come in my Sunday best.
D.The price is still too high.
简述在测算疾病的经济负担时应注意的问题。