Every vessel shall ________maintain a proper look-out by sight and hearing as well as by all available means appropriate in the prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision.
A.
in fog
B.
at night
C.
always
D.
at all times
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【单选题】下列关于外码属性的语法的说法中错误的是______。 A) 在外码属性后加“FK”标注来识别 B) 在一个实体集中,继承属性可以作为部分或全部主码 C) 属性名一般用名词或名词短语来表示 D) 一个外码属性只能归属于一个实体集