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【单选题】
下列哪一项不是导致产业退出的可能原因?A.
经济危机型衰退
B.
效率型衰退
C.
资源型衰退
D.
聚集过度性衰退
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】All the letters _____, Bethe took them to the post office.
A.
had been writing
B.
having been written
C.
wrote
D.
had written
【单选题】The couple had been trying to satisfy all the needs of their only youngster, who had been______for more pocket money all the time.
A.
supposing
B.
pleading
C.
trailing
D.
devising
【简答题】按承重结构的静力体系划分，梁式桥可分为简支梁桥、（）和（）。
【单选题】在《CSS规则》中,当确定货件的惯性力时,应进行船宽与初稳性高度比值修正。当该比值 ---- 时,修正系数K2取为1。
A.
>10
B.
≥12
C.
≥13
D.
≥14
【简答题】_________ (后来发现)the lost book had been on the bookshelf all the time.
【单选题】The millions of calculations (involved) , (had they) been done by hand, would (lose) all practical value (by the time) they were finished.
A.
involved
B.
had they
C.
lose all
D.
by the time
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