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【单选题】
利用进气过程中气流的动态效应,改善发动机高低速充气效率的措施有( )。A.
扩大进气管直径
B.
增大进气管弯曲部分的曲率半径
C.
采用多气门机构
D.
可变气门控制技术
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【单选题】听力原文： The origin of Earth's moon, the largest moon in the solar system, is still something of a mystery. There are some theories about its origin however. Now, keep in mind that a theory of the moon's...
A.
Differences between the planets in the solar system.
B.
Methods of determining the composition of Earth and the Moon.
C.
Why Earth has an iron core.
D.
The origin of the Moon.
【简答题】社会市场营销观念认为，企业的一切活动必须将______、______和社会利益三者有机地统一起来。
【单选题】听力原文： The origin of Earth's moon, the largest moon in the solar system, is still something of a mystery. There are some theories about its origin however. Now, keep in mind that a theory of the moon's...
A.
In a geography class.
B.
In an astronomy class.
C.
In a geology class.
D.
In a biology class.
【简答题】社会市场营销观念认为,企业的一切活动必须将()、()和社会利益三者有机统一起来。
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