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【判断题】
语言是人类最重要的交际和思维工具。A.
正确
B.
错误
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反馈参考答案：
举一反三
【多选题】已知某反应系统为 ,其微分方程可以描述为 ,初始条件为时间t为0时,C1的浓度为1,C2,C3为0。 已知k1,k2,k3分别为0.04,1,3。求时间为700时,C1,C2,C3的浓度分别为多少?
A.
0.145085
B.
0.006689
C.
0.848226
D.
0.054613
E.
0.042301
F.
0.796061
【单选题】The Northern Italy prosperity in the I5lh century is mentioned to show______.
A.
the development of civilisations
B.
the rising of banking industry
C.
the mobile nature of money lenders
D.
the decisive effect of banking on economy
【单选题】Which one is NOT mentioned by the author as a reason that contributes to the prosperity of the travel industry?
A.
Some consumers are positioned to sell and seek bargains.
B.
The rising of middle and upper classes in Asia and their purhcase power.
C.
Technology injects new vitality into the industry and makes creativity possible.
D.
The participation andintermediary function of smart young travel retailers.
【多选题】已知某反应系统为 ,其微分方程可以描述为 ,初始条件为时间t为0时,C1的浓度为1,C2,C3为0。 已知k1,k2,k3分别为0.04,1,3。求时间为100时,C1,C2,C3的浓度分别为多少?
A.
0.380817
B.
0.023086
C.
0.596096
D.
0.310942
E.
0.057463
F.
0.546049
【多选题】已知某反应系统为 ,其微分方程可以描述为 ,初始条件为时间t为0时,C1的浓度为1,C2,C3为0。 已知k1,k2,k3分别为0.04,1,3。求时间为1000时,C1,C2,C3的浓度分别为多少?
A.
0.115548
B.
0.00517
C.
0.879282
D.
0.029604
E.
0.066099
F.
0.797527
【多选题】已知某反应系统为 ,其微分方程可以描述为 ,初始条件为时间t为0时,C1的浓度为1,C2,C3为0。 已知k1,k2,k3分别为0.04,1,3。求时间为400时,C1,C2,C3的浓度分别为多少?
A.
0.200683
B.
0.009825
C.
0.789492
D.
0.126276
E.
0.014168
F.
0.721295
【单选题】Which one is NOT mentioned by the author as a reason that contributes to the prosperity of the travel industry?
A.
Some consumers are positioned to sell and seek bargains.
B.
The rising of middle and upper classes in Asia and their purchase power.
C.
Technology injects new vitality into the industry and makes creativity possible.
D.
The participation and intermediary function of smart young travel retailers.
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