电容与电源之间只有能量互换而没有能量消耗，所以理论上电容不消耗电源能量，是储能元件。
参考答案：对
. He was so foolish _______ his car unlocked.
A．to leave
B．that leave
C．as to leave
D．for him to leave
风机实验的目的是什麽？
