The defective places in the furnace （） with fire bricks.<br>A:should be paved<br>B:should be cleaned<br>C:should be dismantled<br>D:should be welded

The defective places in the furnace （） with fire bricks.
A:should be paved
B:should be cleaned
C:should be dismantled
D:should be welded

出自：海船船员证

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