A knocking sound from one cylinder of an operating air compressor indicates （）.

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• A whistle signal of one prolonged，one short，one prolonged and one short blast，is sounded by a vessel（）.

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• What is true if you want to switch undo tablespaces from the current one， called UNDO1， to a new one called UNDO2？（）

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• Phonological rules may move phonemes from one place in the string to another. For example， Modern English verb ask was Old English askian， with the /k/preceding the/s/.Sound change as a result of sound movement is known as m（）.

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• While underway，in fog，you hear a whistle signal of one prolonged blast followed by two short blasts. This signal is sounded by a vessel（）.

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• You are underway and approaching a bend in the channel where vessels approaching from the opposite direction cannot be seen．You should sound（）.

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• A sound which is capable of distinguishing one word or one shape of a word from another in a language is a__________．

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• When does a neutron from one atom collides with the nucleus of another atom, a chain reaction can occur.

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• One of Microsoft's cool people, is Patrick Blackburn. As a test manager for the Product Group, Blackburn's job may sound routine; however, he says it's anything but that.

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• （）it one realizes that it was far from being a satisfactory conference.

  A、changing your mind B、having an impression C、telling the truth D、looking back on ​

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