TYJI-Ⅱ型计算机联锁系统通信正常时，表示各微机间通信状态的指示灯应不停地（）。
参考答案：闪烁
Being a parent is not always easy, and being the parent of a child with special needs often carries with ___ extra stress.
A．it
B．them
C．one
D．him
气压机停运后，继续维持稳定器四塔压力不低于（）。
