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【单选题】

In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants decomposes and from （）.

A、petroleum crystals

B、phosgene gas

C、water vapor

D、carbon monoxide

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更多“In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants decomposes and from （）.”相关的问题
第1题
[单选题] Bacteria which live are said to be aerobic（）

A、in the presence of oxygen  B、without oxygen  C、in the presence of nutrition  D、without nutrition  

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第2题
[单选题] But it is evidently bored and frustrated（）company.

A、speaking of  B、for lack of  C、in honor of  D、in the presence of  

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第3题
[单选题] The presence of air in the condenser of a refrigeration system will （） the condensing pressure.

A、increase  B、reduce  C、maintain constant  D、None of the above is true  

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第4题
[单选题] In the presence of external forces，the center of buoyancy of an inclined vessel is vertically aligned with the（）.

A、center of gravity  B、metacenter  C、center of flotation  D、keel  

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第5题
[单选题] In determining a safe speed（）shall not be among those taken into account.

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  

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第6题
[单选题] The officer in charge of the engineering watch shall continue to be responsible for machinery operations, （）the presence of the chief engineer in the machinery space.

A、as long as  B、unless  C、despite  D、till  

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第7题
[单选题] An oxygen indicator will detect （）.

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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第8题
[] In the presence of external forces ,the center of buoyancy of an inclined vessel is vertically aligned with the（）.

A、A.center of gravity  B、B.metacenter  C、C.center of flotation  D、D.keel  

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第9题
[单选题] An oxygen indicator will detect （）.

A、concentrations of explosive gas  B、an oxygen deficiency in a space  C、the presence of harmful amounts of carbon monoxide  D、All of the above  

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第10题
[] The closed-loop system differs from the open-loop system by（）

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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