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【单选题】
环境保护是可持续发展的基础，保护环境的实质就是保护生产力。()
A.
正确
B.
错误
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【单选题】___________ is the difference between the value of the goods and services that a country exports and the value of the goods and services that it imports.
A.
Trade balance
B.
Trade surplus
C.
Trade deficit
D.
Trade barrier
查看完整题目与答案
【单选题】The services that a freight forwarder renders may often range from routine and basic tasks such as（）or customs clearance to a comprehensive package of services.
A.
the providing of services
B.
the utilizing of services
C.
the booking of space
D.
the loading and unloading
查看完整题目与答案
【简答题】英文:The services that a freight forwarder renders may often range from routine and basic tasks such as the booking of space or customs clearance to a comprehensive package of services covering the tota...
查看完整题目与答案
【单选题】用一连续精馏塔分离某二元理想混合物。已知原料液的组成为0.5（易挥发组分的摩尔分数，下同），馏出液组成为0.95，釜残液组成为0.02。若进料量为100kmol/h，则馏出液的流量为（）kmol/h。
A.
51.61
B.
48.26
C.
65.18
D.
55.20
查看完整题目与答案
【简答题】The services that a freight forwarder renders may often range from routine and basic tasks such as （ ）or customs clearance to a comprehensive package of services．
查看完整题目与答案
【单选题】用一连续精馏塔分离某二元理想混合物。已知原料液的组成为0.52（易挥发组分的摩尔分数，下同），馏出液组成为0.98，釜残液组成为0.015。若进料量为100kmol/h，则重组分的回收率为（）。
A.
97.82%
B.
1.38%
C.
98.62%
D.
47.67%
查看完整题目与答案
【简答题】• Originally, a(1)_ _ was a commission agent performing routine tasks on behalf of the exporter or importer such as loading or unloading of goods, (2)_ _, arranging loacal transport,(3)_ for his custo...
查看完整题目与答案
【单选题】( ) is the difference between the values of the goods and services that a country exports and the value of the goods and services that it imports.
A.
Trade balance
B.
Trade surplus
C.
Trade deficit
D.
Trade barrier
查看完整题目与答案
【单选题】一连续精馏塔分离某二元理想混合物,已知进料量F=10 kmol/s,进料组成xF = 0.5(摩尔分率,下同),进料为饱和蒸汽,塔顶产品的组成xD=0.95,塔底产品的组成xW=0.1,系统的相对挥发度α=2。塔底采用再沸器,塔顶采用全凝器,泡点回流, 试求:塔顶易挥发组分回收率为()
A.
0.85
B.
0.89
C.
0.95
D.
0.99
查看完整题目与答案
【单选题】一连续精馏塔分离某二元理想混合物,已知进料量F=10 kmol/s,进料组成xF = 0.5(摩尔分率,下同),进料为饱和蒸汽,塔顶产品的组成xD=0.95,塔底产品的组成xW=0.1,系统的相对挥发度α=2。塔底采用再沸器,塔顶采用全凝器,泡点回流, 试求:塔顶产品采出率为()
A.
0.37
B.
0.42
C.
0.47
D.
0.52
查看完整题目与答案
相关题目：
【单选题】___________ is the difference between the value of the goods and services that a country exports and the value of the goods and services that it imports.
A.
Trade balance
B.
Trade surplus
C.
Trade deficit
D.
Trade barrier
查看完整题目与答案
【单选题】The services that a freight forwarder renders may often range from routine and basic tasks such as（）or customs clearance to a comprehensive package of services.
A.
the providing of services
B.
the utilizing of services
C.
the booking of space
D.
the loading and unloading
查看完整题目与答案
【简答题】英文:The services that a freight forwarder renders may often range from routine and basic tasks such as the booking of space or customs clearance to a comprehensive package of services covering the tota...
查看完整题目与答案
【单选题】用一连续精馏塔分离某二元理想混合物。已知原料液的组成为0.5（易挥发组分的摩尔分数，下同），馏出液组成为0.95，釜残液组成为0.02。若进料量为100kmol/h，则馏出液的流量为（）kmol/h。
A.
51.61
B.
48.26
C.
65.18
D.
55.20
查看完整题目与答案
【简答题】The services that a freight forwarder renders may often range from routine and basic tasks such as （ ）or customs clearance to a comprehensive package of services．
查看完整题目与答案
【单选题】用一连续精馏塔分离某二元理想混合物。已知原料液的组成为0.52（易挥发组分的摩尔分数，下同），馏出液组成为0.98，釜残液组成为0.015。若进料量为100kmol/h，则重组分的回收率为（）。
A.
97.82%
B.
1.38%
C.
98.62%
D.
47.67%
查看完整题目与答案
【简答题】• Originally, a(1)_ _ was a commission agent performing routine tasks on behalf of the exporter or importer such as loading or unloading of goods, (2)_ _, arranging loacal transport,(3)_ for his custo...
查看完整题目与答案
【单选题】( ) is the difference between the values of the goods and services that a country exports and the value of the goods and services that it imports.
A.
Trade balance
B.
Trade surplus
C.
Trade deficit
D.
Trade barrier
查看完整题目与答案
【单选题】一连续精馏塔分离某二元理想混合物,已知进料量F=10 kmol/s,进料组成xF = 0.5(摩尔分率,下同),进料为饱和蒸汽,塔顶产品的组成xD=0.95,塔底产品的组成xW=0.1,系统的相对挥发度α=2。塔底采用再沸器,塔顶采用全凝器,泡点回流, 试求:塔顶易挥发组分回收率为()
A.
0.85
B.
0.89
C.
0.95
D.
0.99
查看完整题目与答案
【单选题】一连续精馏塔分离某二元理想混合物,已知进料量F=10 kmol/s,进料组成xF = 0.5(摩尔分率,下同),进料为饱和蒸汽,塔顶产品的组成xD=0.95,塔底产品的组成xW=0.1,系统的相对挥发度α=2。塔底采用再沸器,塔顶采用全凝器,泡点回流, 试求:塔顶产品采出率为()
A.
0.37
B.
0.42
C.
0.47
D.
0.52
查看完整题目与答案