凹角

凹角 [āo jiǎo]

1. ■ concave angle; {数} re-entrant angle

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常用词组

1. ■ 凹角处 nook;

2. ■ 凹角焊 concave fillet weld;

3. ■ 凹角焊喉 throat of (fillet) weld;

4. ■ 凹角接 {木} bird's-mouth