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8预留孔道时的抽管顺序应( )。

单选题
2021-09-08 14:13
A、先下后上、先直后曲
B、先下后上、先曲后直
C、先上后下、先直后曲
D、先上后下、先曲后直
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正确答案
B

试题解析

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