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【单选题】
1焊缝布置应便于焊接操作; 2焊缝布置应有利于减少焊接应力与变形; 3焊缝的布置应避免密集、交叉或重叠; 4焊缝布置应避开最大应力区和应力集中部位; 5焊缝布置应避开或远离机械加工面; 6便于焊接和检验。 焊缝布置一般应遵循原则( )。A.
①②④⑤⑥
B.
①②④⑤
C.
①②③④⑤⑥
D.
①②③④⑤
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举一反三
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for recalling
B.
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C.
to recalling
D.
at recalling
【简答题】请写出下列单词的日语读音。 お年玉
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