[单选题]One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is

正确答案 ：B

prolonged exposure to high concentrations of CO2 gas causes suffocation

[单选题]Sanitary waste matter will .(1)pass through a screen or cutters (2)come into contact with the bacteria in a tank (3)be discharged, normally without bacteria

正确答案 ：D

(1)(2)(3)

[单选题]PSC officers will come on board for(检查)____next Monday.

正确答案 ：B

inspection

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