定额是一定时期内技术水平与（）水平的反映。 ["管理","质量","安全","物价"]
Which command will configure a directory /commonfiles so that a user cannot delete files owned by other users in the same group?（） ["chmod +S \/commonfiles","chmod 4775 \/commonfiles","chmod 1777 \/commonfiles","chmod -orgx \/commonfile"]
对开三通（对开四通）安装时需找（）水平方向。 ["A、管线轴向 ","B、管线纵向 ","C、与管线45度 ","D、与管线垂直"]
Which of the following supports the XML data type?（） ["A unique index","A composite index","A check constraint","A generated colum"]
偏航余压检查与调节
近代中国城市发展由哪些特点？
