什么叫暗适应?说明它是如何引起的。
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他若想年获利18万。能实现吗?若不能实现。可以采取哪些措施。可行吗?
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From the text we can see that the writer thinks the future of the new room key is().
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(6)().
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According to the first two paragraphs,which of the following is NOT true?()
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(3)().
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Which of the following words can best describe a proper handshake?()
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(8)().
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(10)().
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(5)().
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(5):()
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