下载APP
【单选题】
在双层滤池采用无烟煤和石英砂时，煤砂混杂与否或是否出现分层，主要取决于煤砂的（）。
A.
相对密度
B.
粒径
C.
相对密度与粒径
D.
有效直径
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...
A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.