(-4)a+23a=(-4+23)a=(-123+23)a=-103a.
故答案为:-103a.
改错。
( ) 1. Look for the window. Snow is falling. __________________
A B C
( ) 2. Can you skating? __________________
( ) 3. I want to learning. __________________
关于心跳停止的叙述,错误的是()
A.心脏输出低于正常
B.周身血液循环处于停止状态
C.心脏停搏
D.心室纤颤
E.电-机械分离