Discussion
Three of the following are conventionally left unsectioned. The exception is
Answer: D
Correct answer: the wall of a hollow casting
The wall of a casting is exactly what a section exists to show, so it is hatched in the ordinary way. The other three are among the parts conventionally left unsectioned: a bolt, a key and a web cut along its length would all show as meaningless solid hatching, and in the case of the web would wrongly suggest a solid flange.
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