行规规定:施工特定行车办法引导接车并正线通过时,特定引导手信号必须在()已显示或出站(发车进路)信号机已全部开放,并且()的情况下,方可显示。
参考答案:站内通过手信号;不再变更
Tom took a taxi to the airport, only _____ his plane high up in the sky.
A.finding
B.to find
C.being found
D.to have found
体内维生素B1缺乏,TPP效应是()
A.<15%
B.>16%
C.<12%
D.>25%
E.>18%