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【单选题】
无限大真空中一半径为b的球，内部均匀分布有体电荷，电荷总量为q。在，r＞b的球外，任一点r处电场强度的大小E为( )。A.
B.
C.
D.
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举一反三
【单选题】The ratio of the height of a vessel’s rudder to its width is referred to as the（）.
A.
aspect ratio
B.
constriction ratio
C.
rudder ratio
D.
steering ratio
【简答题】A．investors B．developers C．designers D．stakeholders
【单选题】Which statement about stakeholders is BEST?
A.
Stakeholders wield considerable power.
B.
Stakeholders can potentially impact project development.
C.
Stakeholders are external to a company.
D.
By definition, clients are not stakeholders, they are customers.
【简答题】the ratio of channel width to channel length
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