【单选题】
硫化氢的阈限值为___ppm。
A. 10
B. 15
C. 20
D. 30
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A
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在持续状态下，除非在新鲜空气中，否则暂时嗅不到什么气味，当浓度高于时___mg/m3，人的嗅觉迅速被钝化而闻不到臭鸡蛋味。此种情况是最危险的。
A. 7
B. 10
C. 20
D. 30
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在20℃、一个大气压条件下，1体积的水可以溶解___体积的H2S气体，故用水和油浸湿的毛巾并不能长久阻止硫化氢进人人体。
A. 2.8
B. 2.9
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佩带正压式空气呼吸器前首先打开气瓶开关，会听到警报器发出短暂的音响；气瓶开关完全打开后，检查空气的贮存压力，一般应在___MPa。
A. 12-24
B. 20-25
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D. 30-35
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当处于高浓度___ppm的硫化氢环境时，人会由于嗅觉神经受到麻痹、钝化而快速失去嗅觉（嗅觉失灵），反而闻不到硫化氢的气味了。
A. 15
B. 20
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D. 100
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在作业场所，可能会遇到硫化氢气体时，应遵循设置标志牌的规定，在明显的地方设置标志，张贴如“此线内必须佩戴呼吸保护设备”等清晰的___。
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___可能会出现：视线模糊，有光圈感；眼睛灼痛，流泪，红肿发炎，怕光；呼吸困难、流涎、呼吸道粘液多，呼出的气体有硫化氢味，咳嗽、胸闷、胸痛。
A. 吸入低浓度的硫化氢
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现场需要24小时连续监测硫化氢浓度时，应采___硫化氢监测仪，用于监测井场中硫化氢容易泄漏和积聚场所的硫化氢浓度值。
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二氧化硫在大气中的含量超过5.4mg/m3（2ppm）（例如在产生硫化氢的燃烧或其它操作期间），应在现场配备___检测仪或带有检测管的比色指示监测器。
A. 固定式硫化氢
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正压式空气呼吸器在一个呼吸循环过程中，面罩上的呼气阀和口鼻上的吸气阀都为单方向开启，所以整个气流是沿着___构成一个完整的呼吸循环过程。
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【单选题】
有硫化氢溢出或泄漏的警报后撤离时，若发现有人倒地或出现意外时，首先应___或等待专业人员的救护。
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Q/SY1553《井下作业井控技术规范》规定：井控装备、井控工具要实行专业化管理，由___负责井控装备和工具的站内检查（验）、修理、试压，并负责现场技术服务。所有井控装备都要建档并出具检验合格证。
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C. 井控车间（站）
D. 使用单位
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choose four___
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What are two challenges of using a network-based IPS？ ___
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