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【单选题】
如果系统经过一系列变化,最后又变到初始状态,则系统的 ( )A.
Q=0, W=0, ΔU=0, ΔH=0
B.
Q≠0, W≠0, ΔU=0, ΔH=0
C.
Q=-W, ΔU=Q-W, ΔH=0
D.
Q≠0, ΔU=Q-W, ΔH=0
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举一反三
【简答题】The applicants are required to know several computer languages.
【简答题】The notices ______ in several languages, which makes everyone understand them. (write)
【单选题】A (knowledge) of several languages is essential to the study of comparative literature because (without them) one can read (only) (in) translation.
A.
knowledge
B.
without them
C.
only
D.
in
【单选题】The notice was written in several languages ______ foreign tourists should misunderstand it.
A.
so that
B.
if
C.
lest
D.
otherwise
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