两点之间的所有连线中,( )最短。
线段
Pompeii _______ by so many tourists that some of the relics are not well protected.
A.has been visited
B.is visited
C.is visiting
D.was visited
关于脚手架的拆除说法正确是()。
A.拆除前应对施工人员进行交底
B.单、双排脚手架拆除作业必须由上而下逐层进行,严禁上下同时作业
C.应拆立柱再拆大横杆
D.拆除的构配件应由垂直运输设备向下运送,严禁直接抛掷至地面
E.连墙件必须随脚手架逐层拆除,严禁先将连墙件整层或数层拆除后再拆脚手架