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【单选题】
即使还在用普通冰箱，只要你坚持，每台冰箱每年也能省20多度电。以下哪个不是节能用冰箱法（）A.
一定时断电一次
B.
及时除霜
C.
尽量减少开门次数
D.
将冷冻室内需解冻的食品提前取出，放入冷藏室解冻
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