Bevel angle? Groove angle? Who cares, let's just get this over with. I wonder if the exam proctor will let me use a protractor to double-check my answer. *laughs*
Groove angle, definitely. The diagram clearly shows a groove, and #4 is pointing right at it. This is a straightforward question if you pay attention to the details.
Okay, let's see... #4 is definitely not a bevel face or groove face, so it's gotta be either B or C. I'm going with bevel angle since that seems to fit the visual better.
Hmm, the image shows a detailed diagram, but this question is a bit tricky. I think it's asking about the specific part labeled #4, which looks like a groove angle to me.
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