The soldier was of running away when the

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问题选择题

The soldier was of running away when the enemy attacked. [ ]

A. scolded

B. charged

C. accused

D. punished

答案

答案：C

选择题

— We need a room for tonight, and I’d like to take a chance to check in without reservation.

— Don’t you know about the jammed hotels in this season? ______.

A．Better play it safe

B．Do as you please

C．No problem

D．Think nothing of it

计算题

如图12所示电路，电源电压不变，的阻值为10欧，滑动变阻器上标有“20Ω 2A”字样，闭合开关S，当滑动变阻器的滑片P滑到中点时，电压表的读数为15伏。求：

（1）电源电压是多少？

（2）如果变阻器的滑片P在a、b之间滑动，求电

表示数的变化范围是多少？