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【单选题】
集合P={x|x≤4},则A.
π∉P
B.
π P
C.
{π}∈P
D.
{π} P
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举一反三
【单选题】According to the text, 'no country can afford to throw in the towel' probably means ______.
A.
No country can admit to be defeated by Australia.
B.
No country has the resources to beat Australia.
C.
No country can imitate Australia's outdoor image.
D.
No country has the same advantages with Australia.
【简答题】选区激光熔化成型工艺流程的最后工序是 。
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