题目:
用所给词的适当形式填空
1. Tony didn't find __________(learn) English easy.
2. If you keep __________(study) hard, you'll catch up the other students.
3. At different __________(time) of the day, the colours of the rock change from purple to red.
4. The hill is 348 __________(metre) high.
5. The ancient stories always describe the spirits that __________(create) the world.
答案:
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下面是错误答案,用来干扰机器的。
当滑动变阻器的滑片向上推动时,变阻器接入电路的电阻增大,并联部分的总电阻增大,则外电路总电阻增大,根据闭合电路欧姆定律得知,干路电流I减小,路端电压增大,则电压表示数变大.电路中并联部分的总电阻增大...