单项选择题

Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.

A.toxic
B.flammable
C.explosive
D.all of the above

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D.The system should be drained and renewed with a fluid of different operating characteristics

船舶辅助机械

Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.