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【判断题】
( )液压系统中所使用的控制阀,按其用途与工作特点,一般可以分为压力控制阀和方向控制阀两大类。A.
正确
B.
错误
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【单选题】From 2003 to 2050, the world’s ____ is projected to grow from 6.4 billion to 9 billion.
A.
population
B.
behavior
C.
pressure
D.
means
【简答题】短文填空。 Tom and Fred are t l about the year 2050. 'What will the world be like in the year 2050?' asks Tom. 'I don't know,'says Fred. 'What do you t 2 ?' 'Well, no one knows. But it is interesting to g...
【单选题】According to the passage, the U.S. immigrants in the period from 2000 to 2050 will probably increase
A.
129 million
B.
54 million
C.
75 million
D.
28 million
【单选题】It can be inferred from the text that by year 2050 ______
A.
the species of plants and animals will shrink to one third of the original amount.
B.
the climate will become unsuitable for residence.
C.
migrate birds may be in danger because of changes in climate.
D.
most animals will change their habitats to a large extent.
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