题目:
根据句意或中英文提示写出所缺单词。
1. Water covers about three quarters of the earth’s ____________.(表面)
2. _____________(though) he is very clever, he doesn’t work hard at his lessons.
3. Are you ___________ (sure) Mr Wang will come to our meeting?
4. ______________ with life on Earth, life on Mars will be better in many ways.(比较)
5. The Great Wall is one of the ____________ (unusual things that fill people with surprise) in the world.
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:根据法拉第电磁感应定律可得,匝数为1,设铜圆环的电阻为R,则产生的电流为,其中面积和电阻都是定值,从b图中我们可得0-1s内电流恒定,所以是一个定值,即磁场B随之间均匀变化,并且电流方向为...