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【简答题】
对于SLS工艺来说,粉末平均粒径越小,其烧结速率越( ),烧结件的强度也越( )。
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【单选题】---It is reported that a Boeing 777-200 plane became lost in communication (失去联系) at midnight __________ the early morning of March 8th． ---I was amazed to hear that.
A.
at
B.
in
C.
on
D.
of
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