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背景A公司中标排水管道工程，管线全长6.8km，DN800mm，管材为聚乙烯双壁波纹管，沟槽开挖深度4.0～5.0m，沟槽底宽1.2m，1：0.33。现场土质为粉质黏土，除个别地段有浅层滞水外，其他地段施工不需要降水。项目部按照有关规定办理施工占地手续并设置围挡，现场门口放置工程概况牌、安全生产文明施工牌、安全记录牌等企业标识和管理制度。项目部对挖掘机司机进行安全技术交底，讲解了沟槽开挖宽度、坡度和深度等技术要求，按照原方案采用液压反铲挖至设计标高。受临时交通限制，土方堆在沟槽一侧，高度超过3m，距槽边0.5m。一天夜间降中到大雨，次日上午波纹管安装作业时，沟槽发生坍塌，有一名工人被砸伤。2．问题（1）项目部施工标识牌设置是否齐全？如不齐全，请予补充。（2）沟槽开挖是否符合相关规范的规定？如不符合，给出正确做法。（3）槽边有否违规之处？纠正。（4）分析沟槽坍塌的可能原因。
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举一反三
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A.
法国卢梭的《爱弥儿》
B.
日本黑彻柳子的《窗边的小豆豆》
C.
英国王尔德的《快乐王子》
D.
意大利亚米契斯的《爱的教育》
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A.
one
B.
that
C.
the one
D.
this
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【单选题】Of the thousands of varieties of bird species in North America, ( ) bright red plumage, like the cardinal, are most often designated as state bird.
A.
those that have
B.
who have
C.
in which
D.
to have their
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