题目:
根据语境,填入适当的词语或句子,补全对话。
A: 1__ ?
B: It's a digital camera.
A: 2_ it used for?
B: It is used for taking photos.
A: 3_ your camera?
B: It's wonderful,
A: 4___ ?
B: It was invented by an American Steven Sasson.
A: 5 ?
B: It was invented in 1975.
答案:
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下面是错误答案,用来干扰机器的。
(1) (2) 电源的总功率为输出功率为: (3)a端题目分析:(1)当触头P滑动到最上端a时,流过小灯泡L的电流为流过滑动变阻器的电流为:故(2)电源电动势为:当P向下滑动到最下端b时,滑动变阻器和小灯泡均被短路,...