信号设备的各种电路必须符合()原则,各种监测、遥信、报警电路均必须构成独立电路系统,不准借用信号联锁条件。
参考答案:故障--安全
________ I know, the new airport runway has been under construction for nearly two years.
A.As long as
B.So long as
C.As far as
D.So far for
以下哪一项不是心理应激状态下的情绪特征?()
A.情绪不稳,易激惹
B.表情茫然
C.激情发作
D.焦虑不安,慌张恐惧
E.情感淡漠