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【单项选择题】

R-12 is generally considered to be a safe, nontoxic, nonflammable, and non-explosive refrigerantIt can, however, become highly toxic when ().

A、A.superheated outside the system

B、B.in contact with an open flame

C、C.heated to the boiling point

D、D.All of the above

更多“R-12 is generally considered to be a safe, nontoxic, nonflammable, and non-explosive refrigerantIt can, however, become highly toxic when ().”相关的问题
第1题

A、General commander  B、Commander general  C、Search commander  D、On-scene commander  

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第2题

A、R 12.18.8.0/24 [120/1] via 12.18.2., 00:00:10, Serial0  B、R 12.18.11.0/24 [120/7] via 12.18.9.1, 00:00:03, Serial1  C、C 12.18.1.0/24 is directly connected, Ethernet0  D、R 12.18.5.0/24 [120/15] via 12.18.2.2, 00:00:10, Serial0  

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第3题

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第6题

A、R-2日12点前  B、R-1日12点前  C、R12点前  D、R+1日12点前  

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第7题

A、3CO212.5ATP  B、2CO212ATP  C、3CO2和16ATP  D、3CO212ATP  

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第8题

A、containers are classified as general purpose (dry cargo) container and specific purpose container  B、general purpose container (GP) is suitable for the widest varieties of cargo  C、specific purpose container is suitable for the specific cargo  D、bulk containerreefer container, open-top container are all general purpose containers  

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第9题

A、containers are classified as general purpose (dry cargo) container and specific purpose container  B、general purpose container (GP) is suitable for the widest varieties of cargo  C、specific purpose container is suitable for the specific cargo  D、bulk containerreefer container, open-top container are all general purpose containers  

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