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【单选题】
一定量的理想气体,经历某一过程后,温度升高了。则根据热力学定律可以断定为: ( 1 ) 该理想气体系统在此过程中吸热; ( 2 ) 在此过程中外界对该理想气体系统作正功; ( 3 ) 该理想气体系统的内能增加了; ( 4 ) 在此过程中理想气体系统从外界吸热,又对外作正功。以上正确的断言是A.
( 1 ) 、 ( 3 )
B.
(2 ) 、 ( 3 )
C.
( 3 )
D.
(3 ) 、 ( 4 )
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【单选题】Since the energy crisis, these big cars have become a real liability. They cost too much to run.
A.
lack of reliability
B.
substitute
C.
costly means of transport
D.
disadvantage
【单选题】Since the introduction of the new technique, the production cost______greatly．
A.
reduces
B.
is reduced
C.
is reducing
D.
has been redused
【单选题】Since the introduction of the new technique, the production cost______greatly.
A.
reduces
B.
has been reduced
C.
is reducing
D.
is reduced
【单选题】Since the introduction of the new technique, the production cost ______ greatly.
A.
reduces
B.
is reduced
C.
is reducing
D.
has been reduced
【简答题】Since the introduction of the new technique, the (produce) ______ cost has been reduced greatly.
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