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【简答题】
物质A在一定的温度和压力的条件下,其在 醋酸丁酯 / 水体系中的 分配系数 为 45 ,现 用 1/3 体积的醋酸丁酯进行萃取, (1)计算其理论收率?(2) 若用 等 体积的醋酸丁酯进行三级错流萃取,则其理论收率? (保留小数点后两位)
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举一反三
【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 function of the turboprop reduction gearbox is to transfer the ( ) turbine power to ( ) power in order to drive the propeller
A.
high speed and high torque, high speed and low torque
B.
low speed and high torque, high speed and low torque
C.
high speed and low torque, low speed and high torque
【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】In 605, the emperor gave an order to transfer the capital from Chang'an to ___________.
A.
Beijing
B.
Luoyang
C.
Yingtian
D.
Nanjing
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