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【多选题】
当LAC处于：A.
下降阶段LAC >LMC，Ec<1，规模报酬递增;
B.
下降阶段LAC >LMC，Ec<1，规模报酬递减;
C.
下降阶段LAC >LMC，Ec<1，规模报酬递减;
D.
上升阶段，LAC 1，规模报酬递减;
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【单选题】The first birds appeared during late Jurassic times. These birds are known from four very good skeletons, two incomplete skeletons, and an isolated feather, all from the Solnhofen limestone of Bavaria...
A.
nesting materials
B.
four skeletons in good condition
C.
two fragmented skeletons
D.
a single feather
【简答题】Flying across the Atlantic for the first time was a great .
【简答题】月饼的生产合格率为 99.36%属于 数据
【单选题】When was the first flying boat made?
A.
At the time of the Wright brothers.
B.
It’s still developing.
C.
About two years ago.
D.
Not mentioned.
【单选题】When the government of Newtown first ordered people to kill rats, people were ______.
A.
very happy to kill many rats
B.
so lazy that they killed many rats
C.
too lazy to kill many rats
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