Extract 1, 2 and 3 all imply the importance of______..

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  A . (1)+(2) B . (1)+(3) C . (2)+(3) D . (1)+(2)+(3)

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• Which SELECT statement should you use to extract the year from the system date and display it in the format "1998"? （）

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• （）continuously extract the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.

  A . The oil mist detectors B . The smoke detectors C . An oily water monitor D . Oil discharge monitoring and controlling system

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• ______continuously extract the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity(不透明性) measuring track.

  A.The oil mist detectors B.The smoke detectors C.An oily water monitor D.Oil discharge monitoring and controlling system

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