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【单选题】
下列属于纵向研究的是（）A.
民意测验
B.
市场调查
C.
同期群研究
D.
人口普查
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【简答题】英译汉 Waste disposal Waste material must never be allowed to accumulate in the laboratory; it should be removed regularly from the working area for storage in suitable containers so that it can be dispo...
【单选题】Match the news with the right headlines. 为下面的新闻选择合适的标题。 The plastic used on some concept vehicles is called polyethylene terephthalate (PET) and is the same material used to make plastic drinking bott...
A.
Composites enhance performance.
B.
Plastic makes your car more affordable yet powerful.
C.
Switchable lenses improve vision
D.
Bacterium makes nature’s strongest glue
【简答题】语法填空: Since 61 first fully artificial plastic was invented in 1907, humans 62 (find) innumerable uses for the material. It has found 63 (it) way into our tools, our clothes and even our bodies. In a n...
【简答题】常用蜗杆的头数为____头,用于 自锁作用的蜗杆应选用____头。
【简答题】常用蜗杆的头数为( ),用于自锁作用的蜗杆应选用( )头。
【简答题】Plastic is everywhere because plastic is an extremely useful material. It is cheap, strong and lightweight. What’s more, it can take on nearly any form or shape, from soft and stretchy (有弹性的) to hard ...
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