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【判断题】
( )零件产生疲劳原因是承受了突然的交变载荷,使其力学性能发生了突然的变化。A.
正确
B.
错误
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举一反三
【单选题】在温度为T下，CaCO3(s)，CaO(s)，CO2(g)平衡系统的压力为p，已知它们之间存在反应CaCO3(s) = CaO(s) + CO2(g)，若向该平衡系统加入CO2(g)，当重新达平衡时，系统的压力（ ）。
A.
变大
B.
变小
C.
不变
D.
可能变大也可能变小
【单选题】某热力管网工程，架空管道保温棉毡厚12cm。项目部确定本工程施工质量控制的重点是管道焊接和保温，保温施工中，保温棉毡至少应分为______层施工。
A.
1
B.
2
C.
3
D.
4
【单选题】— Can you imagine that we've translated 30% of the long article today? — _____. You're so smart and quick! [ ]
A.
It's a pleasure
B.
I don't mind
C.
That's it
D.
I can't believe it
【简答题】管道外部加保温层的目的是（）管道的热阻，（）热量的传递
【单选题】Imagine being laid up in a hospital and, as you're wheeled down the sterile hallway, along strolls a three-foot-tall horse wearing yellow rubber booties and a backpack full of daisies. No, you're not ...
A.
doctors like pets and want to keep them where they work.
B.
evidence shows that pets help patients recover.
C.
patients can help train and register these pets.
D.
some experiments need these pets.
【简答题】阅读理解。 Imagine you're at a party full of strangers. You're nervous. Who are these people? How do you start a conversation? Fortunately, you've get a thing that sends out energy at tiny chips in everyon...
【简答题】Imagine you’re at a party full of strangers. You’re nervous. Who are these people? How do you start a conversation? Fortunately, you’ve got a thing that sends out energy at tiny chips in everyone’s na...
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