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【单选题】
有关O3的说法，哪项是不正确的A.
属污染物
B.
人呼吸道深部
C.
来自汽车尾气
D.
可引起哮喘发作
E.
儿童对O3敏感
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皮皮学刷刷变学霸
举一反三
【单选题】Each walker's sponsorship money goes to one
A.
teacher.
B.
student.
C.
school.
D.
one community.
【简答题】已知生产函数为Q=min(L，2K)， (1)如果产量Q=20单位，则L与K分别为多少? (2)如果价格为(1，1)，则生产10单位产量的最小成本是多少?
【单选题】—Jimmy lost his key yesterday． —_________? It－s his third time in just one month．A．
A.
23． —Jimmy lost his key yesterday． —_________? It-s his third time in just one month． A． Has he
B.
Did he
C.
Was he
D.
Does he
【单选题】The day before yesterday, I ______ one of my old friends in the street. A．meetB．metC．will meetD．
A.
23. The day before yesterday, I ______ one of my old friends in the street. A．meet
B.
met
C.
will meet
D.
have met
【简答题】已知生产函数为Q=min(L，2K)
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