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    17、A British company has developed a camera that can detect（探测） weapons and hidden drugs, which is a great ______ for the security industry．

    A．breakthrough           B．introduction          C．principle          D．conclusion

    17、A

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    A British company has developed a camera that can detect（探测） weapons and hidden drugs, which is a great ______ for the security industry．

    A．breakthrough           B．introduction          C．principle          D．conclusion

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