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【简答题】
给出下列函数： ①y=x 2 -x+2，x＞0； ②y=x 2 -x，x∈R； ③y=t 2 -t+2，t∈R； ④y=t 2 -t+2，t＞0． 其中与函数y=x 2 -x+2，x∈R相等的是______．
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A.
He might be an air-courier company clerk ( 职员 ).
B.
He might be an airline official.
C.
He might be Brian’s customer.
D.
He might be a guard at the airport.
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A.
What is the boarding time?
B.
What is take-off time?
C.
Do I need to get up early?
D.
When do I have to check in?
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A.
资本由货币资本转化为生产资本的时间
B.
资本由商品资本转化为货币资本的时间
C.
生产资料的储备时间
D.
生产过程中自然力作用于劳动对象的时间
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【简答题】听下面一段材料，回答第1-3题。 1. Who is the speaker? A. An air hostess. B. A tour guide. C. An airline clerk. 2. What should Mr. Jones do when he checks in? A. Show his ticket and passport and weigh his luggage. B...
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