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单项选择题
方差越大,越接近平推流
A、正确
B、错误
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相关考题
问答题
为研究风对高层建筑物的影响,在风洞中进行模型实验,当风速为9m/s时,测得迎风面压强为42Pa,背风面压强为-20Pa,试求温度不变,风速增至12m/s时,则迎风面和背风面的压强分别是:
多项选择题
What aspects should beattached importance to in the construction of humanistic hospital and the promotion of hospital ideological construction?
A、Pay attention to daily contact, experience silence but effective way of communication.
B、Enrich the media in the hospital and strengthen the information exchange and penetration
C、Enrich the media of the hospital’s, achieve the penetration of the information exchange
D、Focus on new media and plan for a better future
单项选择题
与液压传动相比,由于气体的可压缩性大,因此气动执行机构的运动稳定性低、定位精度不高。
A、正确
B、错误
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