向东走3米记作+3米,那么-4米表示______.
∵向东走3米记作+3米,
∴-4米表示向西走4千米.
故答案为向西走4千米.
患者男,50岁,缺失,深覆,做基牙,可摘局部义齿修复,缺隙龈距离偏低
间隙卡环的连接体起加强丝的作用,下列要求哪一项是错误的()
A.连接体的纵行段尽量短
B.连接体的纵行段尽量长
C.连接体转弯处应该成钝角
D.连接体最好呈扁平状
E.连接体应该埋于塑料基托宽度和厚度的中部
The goods which are carried into and out of the territory by the same vessel or aircraft are defined as
A.transit goods B.transshipment goodsC.through goods D.import and export goods