A technician suspects the AC voltage into a PC power supply is bad. Which of the following toolswould MOST likely be used to confirm the diagnosis?（）
Which of the following is backed up with the mksysb command when a system consists of the volume groups rootvg, vol1, and vol2?()A.All filesystems in rootvg, vol1, vol2B.All locally mounted filesystems in the rootvgC.All files in the rootvg and system files in vol1 and vol2D.All local and remotely mounted filesystems
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环氧乙烷在空气中的爆炸极限是（）。A、3～100%（vol）B、3.1～32%（vol）C、3.2～80%（vol）D、3.3～100%（vol）
氢气处理工序开车时系统含氧量应控制在（）A、＜0.5%（vol）B、＜1.0%（vol）C、1.5%（vol）D、2.0%（vol）
丁烯-1在空气中的爆炸极限范围为（）。A、1.6～9.3vol％B、4.5～20.5vol％C、6.0～36.5vol％D、7.5～51.5vol％
If a technician suspects that the voltage being delivered to a desktop computer’s power supply is insufficient or incorrect, which device should be used to determine the correct voltage?（）A、A power supply testerB、A multimeterC、A loopback adapterD、A cable tester
After opening up the lid of a laptop that is powered on, nothing is displayed on the LCD. Opening and closing the lid multiple times usually causes the display to regain the signal. Which of the following components should the technician check FIRST?（）A、MotherboardB、Video cardC、Cutoff switchD、AC adapter
关GMDSS的资料刊登在无线电信号书（）A、VOL3B、VOL4C、VOL5D、VOL6
