已知∠A=90°,AB=AC,BD平分∠ABC,CE⊥BD,垂足为E,则=( )。
Though we take a great risk of investing in the project, yet it will ______ in the long run.
A.go off
B.turn up
C.pay off
D.come up
在五声音阶基础上,雅乐音阶添加了()和变宫两音;燕乐音阶添加了清角和(),清乐音阶添加了清角和()。