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单选题
648. Inspection and modification required from this SB can decrease the possibility of cracks, which may cause replacement of the units
A
Inspect and modify the unit can possible cause the replacement of the units required from this SB
B
After inspection and modification required from this SB, replacement of the unit may be not need because of decreasing possibility of cracks
C
After inspection and modification, Replace the unit because of possible cracks by the require of this SB
答案解析
正确答案：B
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