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【简答题】
水平岩层界线与等高线( )或( )。
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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
【判断题】The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used magnetic audio ...
A.
正确
B.
错误
【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】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】Japan was the first ______ network operators in 2001.
A.
1G
B.
2G
C.
3G
D.
4G
【简答题】Passage Two The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used mag...
【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】春耕时节,开发区某村用一台小型水泵抽水灌溉农田,水泵可以将水从低处抽到高处,水泵的电动机额定电压为220V,该水泵单独接在电路中正常工作30min,电能表表盘示数由2008.6kW?h变为2010.6kW?h,求: (1)水泵的电动机此时的功率是多少? (2)水泵的电动机工作电流是多大? (3)若水泵的电动机消耗的电能全部用来抽水,可将重为多少牛的水提升10m?
【单选题】What was the man's first job in Japan?
A.
He taught English at a community college.
B.
He taught the students how to cook in English
C.
He worked as a language teacher in Tokyo.
D.
He taught culinary arts at a private school
【简答题】乳状液的稳定性理论有什么?
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