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【单选题】
当数控机床长期停机不用时,应每周通电运行一次,每次( ),以防止数据丢失和受潮。A.
30min
B.
1h
C.
1.5h
D.
2h
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【简答题】热力学与统计物理学的研究对象是 。
【简答题】阅读理解。 Millions of Americans return from long-distance trips by air, but their luggage doesn't always come home with them. Airline identification tags(标签) can come loose, and the bags go who-knows-wher...
【简答题】Millions of Americans return from long-distance trips by air, but their luggage doesn’t always come home with them. Airline identification tags（标签） can come loose, and the bags go who-knows-where. And...
【单选题】听力原文：What does Hu want to do at the very beginning? (21)
A.
Hu wants the man to leave because the seat is Hu's.
B.
Hu wants to get to his window seat.
C.
Hu wants to get some food.
D.
Hu wants to get to his aisle seat.
【简答题】热力学与统计物理学的研究对象是
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