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【单选题】
比的亲脂性有机溶剂有A.
CHCl 3
B.
苯
C.
Et 2 O
D.
石油醚
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皮皮学刷刷变学霸
举一反三
【单选题】___ we know, in a chemical change, energy cannot be created, ____.
A.
Which, nor can it be destoyed
B.
As, neither it can be destroyed
C.
As, neither is it able to be destoryrf
D.
What, nor is destoryed
【多选题】Water wheels are machines that use the energy of ______ to turn a wheel. The axle of the turning wheel can then power other machines to do work.
A.
flowing water
B.
or falling water
C.
or both
D.
neither of them
【单选题】下列表述正确的是()。
A.
对漫射表面，光谱吸收比等于光谱发射率
B.
吸收比等于发射率
C.
定向辐射强度与方向无关
D.
对于漫灰体，其吸收比不等于同温度下的发射率
【单选题】For a (n) ___________ system, neither matter nor energy can be transferred between system and surroundings.
A.
closed
B.
open
C.
isolated
D.
None of the above
【简答题】造成直流放大器零点漂移的两个主要原因是( 1 ) ,( 2 ) 的变化。
【单选题】The reason why the first type of perpetual motion machine cannot be successfully manufactured is ( )
A.
energy can neither be created nor destroyed
B.
the loss of work in the actual process is unavoidable
C.
the only forms of energy transfer are heat and work
D.
not all the heat can be converted successfully
【单选题】It is never easy to identify the complexity of the negotiating subject and the priority when it comes to the agenda-making phase in international business negotiation. Some simple issues could be easi...
A.
From easy to difficult.
B.
From difficult to easy.
C.
Both are OK.
D.
Neither is OK.
【单选题】__ we know, in a chemical change, energy cannot be created, ____.
A.
Which, nor can it be destroyed
B.
As, neither it can be destroyed
C.
As, neither is it able to be destroyed
D.
What, nor is destroyed
【单选题】According to the text, what can we learn about aviation fuels?
A.
Biofuels can be used as replacement for vehicles as well as planes.
B.
Neither biofuels nor coals can be used for planes.
C.
The idea of green fuel is to change solar energy into fuels.
D.
The idea of green-fuel, which is only an illusion, is challenged and doubted by scientists.
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