单项选择题

在马克思主义哲学看来，精神是高度组织起来的物质即()的产物，是人们在改造世界的社会实践活动中通过它产生的观念、思想上的成果。

A.现实
B.人脑
C.大脑
D.思想

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What effect did daylight saving have on the energy consumption of Indiana?
A．It saved 1.3 trillion watt-hours in four weeks.
B．It reduced demand for household lighting only in spring.
C．It resulted in an extra $9 million cost on electricity.
D．It reduced demand for cooling and heating all year around.

A.It
B.3
C.
B．It
D.
C．It
E.
D．It
F.

单项选择题

短路功率等于()。

A.短路电流平均值同短路处正常工作电压的乘积
B.短路冲击电流同短路处正常工作电压的乘积
C.短路电流有效值同短路处正常工作电压的乘积
D.短路电流瞬时值同短路处正常工作电压的乘积