Daily Safety Technology Quiz (Single-choice Question) (2016.8.27)
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1. When an inert gas is added to an explosive mixture, once the concentration of the inert gas reaches a certain value, ____. A. The difference between the upper and lower explosion limits is a constant, but it is not 0. B. The upper and lower explosion limits tend to be the same. C. The upper explosion limit remains unchanged, while the lower limit increases. D. The lower explosion limit remains unchanged, but it decreases. 2. Safety valves and burst discs are both safety pressure relief devices for pressure vessels. Compared to safety valves, rupture disks have ____ characteristics. A. Simple structure, fast pressure release response, good sealing performance, poor adaptability. B. Simple structure, good sealing performance, strong adaptability, slow pressure release response. C. Fast pressure release response, good sealing performance, strong adaptability, complex structure. D. Simple structure, fast pressure release response, good sealing performance, strong adaptability. B;D
1. When an inert gas is added to an explosive mixture, once the concentration of this inert gas reaches a certain value, __B__. A. The difference between the upper and lower explosion limits is a constant, but it is not 0. B. The upper and lower explosion limits tend to be the same. C. The upper explosion limit remains unchanged, while the lower limit increases. D. The lower explosion limit remains unchanged, but it decreases. 2. Safety valves and burst discs are both safety pressure relief devices for pressure vessels. Compared to safety valves, rupture disks have __D__ characteristics. A. Simple structure, fast pressure relief response, good sealing performance, poor adaptability B. Simple structure, good sealing performance, strong adaptability, slow pressure relief response C. Fast pressure relief response, good sealing performance, strong adaptability, complex structure D. Simple structure, fast pressure relief response, good sealing performance, strong adaptability
1. B. . ----------------2、D