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【单选题】
在一个绝热刚性容器中发生一化学反应,使系统的温度从Tl升高到T2,压力从P1升高到P2,则( )A.
Q>0,W>0,△U>0
B.
Q=0,W=0,△U=O
C.
Q=0,W>0,△U
D.
Q>0,W=0,△U>O
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【简答题】从物理上来讲 通信系统不使用传输介质的是()
【简答题】He grabbed his suitcase and gave the impression he was boarding the Tokyo plane. (what, why, who, that）A. that
【单选题】He grabbed its skinny trunk of a small tree with both hands, yanked it over sideways, and cracked it in half on his knee. Why do you think he did that?
A.
He did that to show his anger.
B.
He was an idle man.
C.
He was a drug dealer.
【简答题】三相异步电动机被广泛用来驱动各种 机床、 机、中小型 机、水泵及 机械等。
【多选题】He grabbed his suitcase and gave the impression ________ he was boarding the Tokyo plane.
A.
that
B.
/
C.
which
D.
what
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