单选题 1分

A badly warped boiler water tube can be reworked and bent back into shape by _______. I. heating it ...

A badly warped boiler water tube can be reworked and bent back into shape by _______. I. heating it with a torch and reforming it with a soft mallet II. Cold pressing it back into shape with a hydraulic jack
  • A. I only
  • B. II only
  • C. Both I and II
  • D. Neither I nor II

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