57. 'CD' computer abbreviation usually means ?
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58. '.BAK' extension refers usually to what kind of file?
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59. Where is the headquarters of Intel located?
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60. Who co-created the UNIX operating system in 1969 with Dennis Ritchie?
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61. Voltage is sometimes referred to as EMF, or Electromotive...?
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62. What does AM mean?
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63. '.BAT' extension refers usually to what kind of file?
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