题干
When the traffic lights turn red, we should wait _______.
A：quickly
B：patiently
C：slowly
D：happily
答案(点此获取答案解析）
B
When the traffic lights turn red, we should wait _______.
A：quickly
B：patiently
C：slowly
D：happily
elist and a poet but he is more famous ______ his novels.
的高温电离气体，气体以速度v向右流动，并通过专用管道导出。由于运动的电离气体，受到磁场的作用，将产生大小不变的电动势。若不计气体流动时的阻力，由以上条件可推导出可变电阻消耗的电功率
。调节可变电阻的阻值，根据上面的公式或你所学过的物理知识，可求得可变电阻R消耗电功率的最大值为