Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.<br>A:toxic<br>B:flammable<br>C:explosive<br>D:all of the above

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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