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单选题
Tighten the bolts manually if you cannot do it with the specified tool.
A
Tighten the bolts manually until you can do it with the specified tool.
B
Tighten the bolts manually if it is not feasible to do it with the specified tool.
C
In case that you cannot do it with the specified tool in case,tighten the bolts manually.
答案解析
正确答案：B
