A、petroleum crystals
B、phosgene gas
C、water vapor
D、carbon monoxide
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A、in the presence of oxygen B、without oxygen C、in the presence of nutrition D、without nutrition
A、the presence of the background light at night B、the state of wind，sea and current C、the number of crew on board D、the draught in relation to the available depth of water
A、the amount of oxygen in a space B、the presence of harmful amounts of carbon monoxide C、concentrations of explosive gas D、All of the above
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A、A.the lack of a feedback B、B.the presence of a feed back C、C.the lack of a computer D、D.the presence of a computer
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