a-2b=0,
a=2b,
∴3a-ba+2b
=6b-b2b+2b
=5b4b
=54;
故答案为:54.
Tane is timid. Whenever she sees the mouse or a snake, she loses her ____and screams out.
A.heart
B.face
C.head
D.temper
下列不属于施工安全管理策划原则的是( )。
A.一次性
B.科学性
C.动态控制
D.可操作性