某日,一混凝土有限公司的黄砂、石子堆场内,工人像往常一样忙碌不停地运送各种建筑材料。当时公司生产科科长和操作组组长一起来到堆场里的一个贮料罐内,准备对罐体内壁进行检修。两人沿着罐外钢扶梯一步步进入罐内,并顺利到达罐底,随后用 One day, a concrete company yellow sand, pebbles yard, workers, as usual, busy transporting a variety of building materials. At that time, the Chief of Production Section of the Company and the team leader came to a storage tank in the yard to prepare for overhaul of the inner wall of the tank. They walked into the tank one by one along the steel escalator outside the tank and smoothly reached the tank bottom and then used it