Purification Technology Edition Security Question [107]
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This post was last edited by hai8487 on 2017-11-8 at 10:38. True or False: For special high-altitude work, communication signals or devices should be established with the ground, and a dedicated person should be assigned to oversee this. （） √
For special high-altitude work, communication signals or devices should be established with the ground, and a dedicated person should be assigned to oversee it. (right)
For special high-altitude work, communication signals or devices should be established with the ground, and a dedicated person should be assigned to oversee it. （） Correct