【判断题】两个相邻的含水层之间一定存在一个绝对隔水层。
【判断题】两个相邻含水层之间一定存在一个绝对的隔水层。
【单选题】About _____ of the workers in the factory were born in _____ . [ ]
C.
three fifth; the 1970s
【多选题】采集溶解氧水样应在现场固定,固定方法是( )。
【单选题】销售的种子应当附有标签。种子标签应当按照《种子法》的有关规定标注,主要农作物种子还应当标明( )。
【单选题】采集溶解氧水样应在现场固定,固定方法是( )。2
【单选题】.Hawking became world-famous in _______.
A.
his thirties in the 1970’s
B.
the thirties in his 1970
D.
the thirties during the 1970
【多选题】广告变现是短视频赢利的常用方法,也是比较高效的一种变现模式, 怎样的短视频才能通过广告变现呢?