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【单选题】
对于电池反应Cu2+ + Zn=Cu + Zn2+,下列说法正确的是A.
当c(Cu2+)=c(Zn2+)时,电池反应达到平衡
B.
当原电池的电动势为0时,电池反应达到平衡
C.
当Cu2+,Zn2+均处于标准态时,电池反应达到平衡
D.
当原电池的标准电动势为0时,电池反应达到平衡
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举一反三
【单选题】How did the robot behave at the beginning of the test?
A.
It rotated its wings through 90 degrees
B.
It twitched（骤然一抽）but gradually gained height
C.
It was twitched and broke down
D.
It landed not 10ng after the test
【单选题】How did the robot behave at the beginning of the test?
A.
It rotated its wings through 90 degrees．
B.
It twitched but gradually gained height．
C.
It was twitched and broke down．
D.
It landed not long after the test．
【简答题】Airplanes come in many different shapes and sizes depending on the mission of the ____1____, but all modern airplanes have certain components in common. These are the fuselage, wing, tail assembly and...
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