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【单选题】
多晶体的晶粒越细,则其A.
强度越高，塑性越好
B.
强度越高，塑性越差
C.
强度越低，塑性越好
D.
强度越低，塑性越差
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举一反三
【简答题】飞艇内充的气体的密度______空气密度，当飞艇匀速上升时，浮力等于飞艇的______，如果此时从飞艇上抛下一些重物，则飞艇将______上升；要使飞艇回到地面上可以采用的______的方法．
【简答题】飞艇从结构上可分为( )飞艇,( )飞艇和( )飞艇三种类型。
【单选题】以下( )配送方式,只改变产品数量组成性态而不改变产品本身物理、化学性态,一般与采购、集货或干线运输相配合。
A.
加工配送
B.
集输配送
C.
中转配送
D.
供应配送
【单选题】If you are a fan of science fiction, you've no doubt encountered the term nanotechnology. Yet over the past year also, a series of breakthroughs have transformed nanotech from sci-fi fantasy into a re...
A.
dead
B.
decent
C.
prominent
D.
popular
【单选题】听力原文：W: You're not much of a jazz fan, are you? M: It's far from being my favourite kind of music, that' s for sure. Q: What do we know about the man? (17)
A.
He is not a music fan.
B.
Jazz is his favourite kind of music.
C.
He doesn't really like Jazz.
D.
He isn't hot now that he has a fan.
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