Daily Security Technology Quiz (Single-choice Question) (2016.8.28)
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1. When using an inert gas as a displacement medium, it is necessary to ensure that the amount of inert gas used is (generally) more than ____ times the volume of the medium to be displaced. A、2 B、3 C、4 D、5 2. During welding operations, no combustible gases shall be released within ____ meters of the welding site, and no combustible liquids shall be released within ____ meters of the welding site. A、20 meters, 10 meters B、20 meters, 15 meters C、30 meters, 15 meters D、30 meters, 20 meters The correct answers are: B; C
1、B； 2, C, 30 meters, 15 meters
1. When using an inert gas as a displacement medium, it is necessary to ensure that the amount of inert gas used is at least __B__ times the volume of the medium to be displaced. A、2 B、3 C、4 D、5 2. During welding operations, no combustible gases shall be released within __C__ meters of the welding site, and no combustible liquids shall be released within ____ meters of the welding site. A、20 meters, 10 meters B、20 meters, 15 meters C、30 meters, 15 meters D、30 meters, 20 meters
1. When using an inert gas as a displacement medium, it is necessary to ensure that the amount of inert gas used is at least __A__ times the volume of the medium to be displaced. A、2 B、3 C、4 D、5. 2. During welding operations, no combustible gases shall be released within ____ meters of the welding site, and no combustible liquids shall be released within __B__ meters of the welding site. A、20 meters, 10 meters B、20 meters, 15 meters C、30 meters, 15 meters D、30 meters, 20 meters