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【单选题】
混凝土的保护层厚度是指（ ）。A.
纵向受力钢筋外边缘到截面边缘的距离
B.
纵向受力钢筋中心到截面力缘的距离
C.
箍筋外边缘到截面边缘的距离
D.
最外层钢筋到截面边缘的距离
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举一反三
【单选题】There on the shore you can see a steam powered ship covered with dirt _____, waiting to be taken apart. [ ]
A.
lay in ruins
B.
lie in ruin
C.
laid in ruins
D.
lie in ruins
【单选题】It can be inferred from the passage that by 1870 ______.
A.
the steam engine had been invented
B.
a national commission on agriculture had been established
C.
the U.S.horse population was about 10 million
D.
technology began to be more economical
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