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单选题
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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单选题Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.A
toxicB
flammableC
explosiveD
all of the above
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单选题The receiver used in a refrigeration system（）A
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collects non-condensable gasesC
allows refrigerant sub-coolingD
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