Index
=>
MATERIALS.
CHARACTERISTICS OF MATERIALS.
Quiz
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<=
=>
?
hard
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soft
?
rough
?
smooth
?
rigid
?
flexible
?
hard
?
soft
?
rough
?
smooth
?
rigid
?
flexible
?
hard
?
soft
?
rough
?
smooth
?
rigid
?
flexible
?
hard
?
soft
OK
Index
=>
CHARACTERISTICS OF MATERIALS.
