单项选择题
（）about 20 sq.m to be sand-blasted.
A.The rusting area
B.The rusted area
C.The corroded area
D.The corrosive area
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相关考题
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单项选择题
Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this，you should（）.
A.install shoring so the shoring supports the damaged bulkheads without pushing on them
B.install shoring so that it pushes on the damaged bulkhead while supporting it
C.use jacks or chain falls to remove the set before installing shores
D.place sandbags by the bulkhead without installing shores
