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【简答题】
电流沿电压降低的方向称为 方向,这种方向下计算的功率为正值时,说明元件 电能;电流沿电压升高的方向取向称为 方向,这种方向下计算的功率为正值时,说明元件 电能。
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【单选题】Mayor Booker's efforts against crime seem to be ______.
A.
idealistic
B.
impractical
C.
effective
D.
fruitless
【单选题】The research in Paragraph 3 is mentioned to prove that
A.
to use a fan seemed to be effective for infants in high-risk environments.
B.
control infants are matched by county, race, ethnicity and age to the first group.
C.
fans improve ventilation and decrease the chance of rebreathing exhaled carbon dioxide.
D.
using a fan in high-risk environments, infants will no longer die of SIDS.
【单选题】It can be inferred from the 6th paragraph that______.
A.
international treaties are effective in the fight against climate change
B.
Kyoto climate treaty is not as effective as Montreal Protocol
C.
most countries are willing to participate and comply with Kyoto climate treaty
D.
phasing down HFCs would provide the gteatest climate protection of all ways
【单选题】All of them try to use the power of the workstation ___ information in a more effective way.
A.
presenting
B.
presented
C.
beingpresented
D.
topresent
【多选题】Logistics is the process of planning, implementing and controlling the efficient, effective flow and storage of ( ) from point of origin to the point of consumption for the purpose of conforming to cu...
A.
facility
B.
goods
C.
services
D.
information
【多选题】Logistics is the process of planning, implementing and controlling the efficient, effective flow and storage of ( ) from point of origin to the point of consumption for the purpose of conforming to cu...
A.
facility
B.
goods
C.
services
D.
information
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