老年人心理上产生失落感后,常见的情绪表现包括
A.沉默寡言
B.忧郁
C.恐惧
D.急躁易怒
E.表情淡漠
参考答案:A,D,E
谁明确提出电荷分为两种()
A.吉尔伯
B.格雷
C.莱顿
D.杜菲
SafetyNet is a maritime safety information broadcast service offering()on suitably equipped ships.
A.free reception
B.free transmission
C.dedicated reception
D.dedicated transmission