【判断题】证券交易通常都必须遵循价格优先原则和时间优先原则。 ( )
【简答题】证券交易通常都必须遵循价格优先原则和时间优先原则。 ( )
【单选题】The police presence at airports seemed to double _______ after the bomb threat.
【单选题】The crowd was so well-behaved that the police presence was ________.
【简答题】证券交易通常都必须遵循价格优先原则和时间优先原则。( )