Daily Security Technology Quiz (Single-choice Question) (2016.8.21)
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1. During the shutdown and maintenance of chemical processing units, in order to properly isolate the equipment being maintained, which of the following practices is incorrect? ____ A. Remove some pipelines and insert blind flanges. B. Close the relevant valves. C. Insert the relevant blind flanges. D. Use iron sheet in place of blind flanges. 2. The explosion-proof mark for explosion-proof electrical equipment is indicated by the letter ____. A, i B, d C, e D, p D;B
1. D. --------------------2、B