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【判断题】
热通过流动介质将热量由空间中的一处传到另一处的现象叫做热对流。()A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】When Pete saw Jean Grace, he ______.
A.
was very enthusiastic, hoping for some business to be done
B.
was cold but he still served the young customer
C.
was cold, unwilling to serve the young customer
D.
was very warm to the young customer though he did not want to sell anything to her
【单选题】Pete let Jean Grace have the necklace for just a few pennies because ________.
A.
Pete had to give a Christmas present to someone
B.
Pete was rich and could afford it
C.
Pete took Jean Grace for his sweetheart who had died years ago
D.
Pete felt that the love in him was aroused and had the urge to love others
【单选题】What was Pete's attitude when he mw Jean Grace at first?
A.
He was friendly.
B.
He was indifferent.
C.
He was warm-hearted.
D.
He was sympathetic.
【简答题】什么是爬行现象？机床运动部件爬行对机床加工性能的影响包括哪些方面？
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