从三角形的一个顶点到它的对边做一条垂线,顶点和垂足之间的线段叫做三角形的______.
从三角形的一个顶点到它的对边做一条垂线,顶点和垂足之间的线段叫做三角形的高;
故答案为:高.
合成磷脂酰胆碱时所需的活性胆碱是
A.GDP胆碱
B.ADP胆碱
C.UDP胆碱
D.CDP胆碱
Which of the following is true
A.I took the medicine away.
B.The medicine is tasty.
C.I like the medicine anyway.
D.I ate the medicine.