第2题
A thermosetting polymer like epoxy______
A.typically can not be recycled.
B.usually involves the mixing of two or more components which are then polymerized.
C.is relatively strong because molecules are crosslinked together.
D.can not be easily re-shaped after curing
E.all of the above
第3题
A、high polymer
B、polymer compound
C、high polymer complex
D、high polymer compound
第4题
A、oral cavity
B、nasal cavity
C、abdominal cavity
D、body cavity
第5题
A.coin
B.cast
C.mold
D.forge
第7题
A、SRCTITLE=polymer and TITLE=crystal
B、polymer wn journal and crystal wn ti
C、SRCTITLE(polymer) and TITLE(crystal)
D、polymer/st and crystal/ti
第9题
A.nasal cavity
B.pharynx cavity
C.oral cavity
第10题
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