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【单选题】
下列关于流体直管阻力损失的描述错误的是（ ）A.
范宁公式只适合于作层流流动阻力的计算
B.
摩擦因数λ的计算与流体的流动状态有关
C.
对于水力光滑管，摩擦因数λ的计算不用考虑管路粗糙度
D.
对于水力粗糙管，做湍流流动的流体的摩擦因数λ是雷诺数和相对粗糙度的函数
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【单选题】In order for you to transfer, permission must be granted by an official at the ______.
A.
new university
B.
Immigration Office
C.
passport office
D.
foreign student advisor's office
【单选题】某企业持有一张面额为2000元、半年后到期的汇票,若银行确定该票据的年贴现率为5%,该企业可获得的贴现金额为( )6-143 4\13
A.
1850元
B.
1950元
C.
2000元
D.
2050年
【单选题】The author mentions the transfer of momentum and energy in order to indicate that
A.
eddies, and not just jet streams, modify the distribution of temperature and kinetic energy within the atmosphere
B.
the relationship between baroclinic waves and the jet stream that produces them is decidedly reciprocal
C.
the process of secondary atmospheric circulation has a pronounced effect on the location and movement of the jet stream
D.
eddies play as great a role in dictating fluctuations in global temperatures as do the jet stream
E.
the meridional temperature gradient between the equator and poles produces a very diverse variety of atmospheric phenomenon
【单选题】教育观察研究根据观察方式可分为 （ ）[2分]
A.
自然情境中观察与实验室中的观察
B.
直接观察与间接观察
C.
参与性观察与非参与性观察
D.
结构式观察与非结构式观察
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