混凝土桩桩头混凝土强度等级宜比桩身混凝土提高()级,且不得低于C30。
参考答案:1-2
下列属于复合肥料的是 [ ]
A. KCl
B. KNO3
C. NH4NO3
D.Ca(H2PO4)2
The girl looked at me with a ______expression. Maybe the problem was quite _____.
A.puzzling; puzzling
B.puzzling; puzzled
C.puzzled; puzzled
D.puzzled; puzzling