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脱式计算,能简算的要简算。
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银锌纽扣电池放电时的反应为:Zn+Ag2O=ZnO+2Ag,下列有关说法中不正确的是

同类题2

陆地主要集中在(  )

同类题3

阅读理解。

    An English traveler found himself in Norway with only enough money to buy the ticket for him to go back home. As he knew that it would take him only two days to get to England, he decided that he could easily spend the time without food. So he bought a ticket and got on the ship. The man closed his ears to the sound of the lunch bell. When dinnertime came, he didn't go to dinning room, saying that he was not feeling very well.

    The next morning he still didn't have breakfast and at lunchtime he again stayed in his room. But at dinnertime he was so hungry that he went to the dinning room and ate everything the waiter put in front of him. He got ready for the quarrel(争执).

    “Bring me the bill,” he said. “The bill, sir?” said the waiter in surprise. “There isn't any bill. On our ship meals are included (包括) in the money for the ticket,” said the waiter.

同类题4

A good plan must be _______, so that it can adapt to some necessary changes.

同类题5

将一块等腰直角三角板与一把直尺如图放置,若∠1=60°,则∠2的度数为(    )

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