室内防水材料铺设后,必须蓄水检验,( )内无渗漏为合格。
A.12 hB.18 hC.24 hD.30 h
参考答案:C
— Do you know Mo Yan?
—Of course. He is the famous writer ____ won the Nobel Prize in 2012.
A. who B. whom C. which
已发生黄叶病的果园,结果树可用硫酸亚铁溶液(),幼树可()。