开垦土地
参考答案:
是指以垦殖为目的开发土地,即开垦荒地为耕地用于农作物的种植。
主系统吹扫时,N为什么经缓冲罐高点放空阀排至大气?
--- Did you ask the guard _______ happened?
--- Yes, he told me all _______ he knew.
A.what; that
B.what; what
C.which; which
D.that; that