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【单选题】
某气缸中有气体 1.20 L ,在 197.3 kPa 下,气体从环境吸收了 8.00×10 2 J 的热量,在等温等压下体积膨胀到 1.50 L 。根据热力学第一定律,体积功 W 和系统的热力学能变化 △ U 分别是 。A.
59.2 J 和 741 J
B.
-59.2 J 和 741 J
C.
-59.2 J 和 -741 J
D.
59.2 J 和 -741 J
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皮皮学刷刷变学霸
举一反三
【单选题】小纸片会在发声的扬声器上跳动 , 树叶随风荡漾发出 “ 哗哗 ” 的响声,这些现象说明了 ( )
A.
声音是由物体振动产生的
B.
声音能在水中传播
C.
声音的传播需要介质
D.
声音能传递信息
【单选题】The girl usually does her homework _____ it is very late at night.
A.
until
B.
when
C.
before
【单选题】The girl usually does her homework _____ it is very late at night .
A.
until
B.
when
C.
before
D.
after
【单选题】The girl usually has supper by herself ____her parents don't have to work overtime.
A.
until
B.
unless
C.
while
D.
the moment
【单选题】The girl usually has supper buy herself___her parents don't have to work overtime.
A.
until
B.
unless
C.
while
D.
the moment
【简答题】已知3,X,21三个数成等差数列,则X等于( )。
【简答题】听下面一段对话，回答第1小题。 1. How long does the girl usually spend on her homework? A. For half an hour B. For about two hours. C. For about three hours.
【单选题】The girl usually her as supper by herself _________her parents don't have to work overtime.
A.
until
B.
unless
C.
while
D.
the moment
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