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【单选题】
正投影有以下基本性质( )
A.
真实性、类似性、积聚性、从属性
B.
真实性、类似性、积聚性、平行性、从属性、等比性
C.
真实性、类似性、积聚性、平行性、垂直性、等比性
D.
真实性、类似性、积聚性、平行性
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【单选题】I'd rather you _____ that.
A.
don't
B.
won't do
C.
didn't do
D.
haven't done
【单选题】以下不属于BI的内部活动识别的是()
A.
干部教育
B.
废弃物处理
C.
研究发展
D.
产品开发
【单选题】正常物品价格上升导致需求量减少的原因在于
A.
替代效应使需求量增加,收入效应使需求量减少
B.
替代效应使需求量减少,收入效应使需求量增加
C.
替代效应使需求量减少,收入效应使需求量减少
D.
替代效应使需求量增加,收入效应使需求量增加
【单选题】It is time that you __home and I'd rather you__ again tomorrow.
A.
should go; would come
B.
went; came
C.
go; come
D.
should go; will come
【单选题】I'd rather that you ________ home.
A.
went
B.
have gone
C.
will go
D.
had gone
【单选题】I'd rather that you ______ tomorrow than today.
A.
came
B.
will come
C.
had come
D.
is coming
【单选题】I'd rather that you ________ home. A. went B. have gone C. will go D. had gone
A.
went
B.
have gone
C.
will go
D.
had gone
【简答题】一台抽水机用的电动机的功率为2.8 kW,每天运行6个小时,问一个月(30天)消耗多少电能?
【简答题】用一台功率为40kW的电动机带动水泵抽水,供给高出水面24m的水箱,已知水箱容积为50m 3 ,整个抽水装置的机械效率为60%. 求:(1)水箱充满水后,水箱内水的质量; (2)把空水箱充满水,抽水装置做的总功; (3)需多长时间才能把空水箱注满水.(g取10N/kg)
【简答题】乳状液的稳定性理论有什么?
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