水下混凝土的浇筑速度有何要求?
下列关于国立山西大学说法正确的是() ["1947年国立山西大学录取比例不足30%,但是入学后不会被淘汰","各院系的选修科目学校可以自设,但也要报教育部省批","国立山西大学1944年报送的课程教纲达百十种,其中绝大多数是用英文书写的","1943年工学院课程设置,一、二年级皆不分系"]
What is the primary purpose for Digital Selective Calling (DSC)?() ["DSC provides reception of weather and navigational warnings plus search and rescue information","DSC provides low-cost,routine communications for the vessel operator","DSC is to be used for transmitting and receiving distress alerts to and from other ships or coast radio stations via radio","This aids SAR authorities in tracking a vessel's position by satellite"]
当水下混凝土浇筑面积较大时,如何浇筑?
班主任如何对待父母离异家庭的学生?
采用多根导管浇筑水下混凝土时,导管的作用半径有何规定?