Many attendees cancel important puechases in anticipation of an exhibition.
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Exhibitions help praticipating companies to accomplish non-promotional marketingobjectives, because exhibitions increase brand expoure.
A. 对
B. 错
竖井和横通道是暗挖隧道和的临时通道,也是送气通风口和水、电的输入口。
在长隧道施工时,为了缩短工期,要增设、以增加工作面。
竖井常采取的断面形式包括。
A. 矩形
B. 圆形
C. 马蹄形
D. 椭圆形