单选题：当栏杆在基坑四周固定时，可采用钢管打人地面（　　）cm深，钢管离基坑边口的距离不应小于50 cm。

题目内容：
当栏杆在基坑四周固定时，可采用钢管打人地面（　　）cm深，钢管离基坑边口的距离不应小于50 cm。 A．20～50
B．30～50
C．20～80
D．30～80
参考答案：
答案解析：

A)She visited her middle schoo1．C)She was busy workin9．B)She

A)She visited her middle schoo1．C)She was busy workin9．B)She was ill and had to

分类：建筑工程管理与实务  题型：单选题
查看答案

A) She was making a phone call.C) She was having a meeting.B

A) She was making a phone call.C) She was having a meeting.B) She was working in

分类：建筑工程管理与实务  题型：单选题
查看答案

各单位制定的内部会计监督制度，是国家统一会计制度的组成部分。（　）

各单位制定的内部会计监督制度，是国家统一会计制度的组成部分。（　）

分类：建筑工程管理与实务  题型：单选题
查看答案