桥涵、挡土墙等结构物的回填土，宜采用原状土，以防止产生不均匀沉陷，并按有关操作规程回填并夯实。
参考答案：错
Today is my birthday and my mother is ______ a cake ______ me. [ ]
A. making, to
B. making, for
C. doing, to
D. doing, for
表中2012年进口量与上年相比增幅超过10%的矿产品有几类?
A.2
B.3
C.4
D.5
