In What Ways Do Surface Datum Feature Symbol Applications, Axis

question 108

Multiple Choice

In what ways do surface datum feature symbol applications, axis datum symbol applications, and center plane datum symbol applications differ from each other?

• A) When surface datums are shown on extension lines, they are offset from the dimension line arrows, while axis datums and center plane datums can align with dimension line arrowhead.
• B) In surface datum symbols the equilateral triangle is filled, while in axis datums and center plane datums the equilateral triangle is left unfilled.
• C) Axis datums and center plane datums are verified from one of the existing surfaces.
• D) The surface datum is the only one to position the part in relation to a datum reference frame.
• E) none of the above

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Definitions:

Benthic Zone

refers to the ecological region at the lowest level of a body of water such as an ocean, lake, or stream, including the sediment surface and some sub-surface layers.

Littoral Zone

The littoral zone is the area of a lake or ocean shore that is close to the shore, often characterized by shallow waters, where sunlight reaches the bottom allowing aquatic plants to grow.

Limnetic Zone

The open water area of a freshwater body, such as a lake, where sunlight penetrates deeply enough for photosynthesis to occur.

Decomposers

Organisms, such as bacteria and fungi, that break down dead organic material, recycling nutrients back into the ecosystem.