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单项选择题

采用低温储藏时，（），谷物冷却机可结束冷却通风作业。 A.
粮堆最低温度≤15℃且局部最高粮温≤20℃ B.
粮堆平均温度≤15℃且局部最高粮温≤20℃ C.
粮堆最低温度≤20℃且局部最高粮温≤25℃ D.
粮堆平均温度≤20℃且局部最高粮温≤25℃

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热门试题

单项选择题Why is the narrator able to reconstruct her ethical value of small Canadian town?

A.She eventually understands that the meaning of life does not lie in material pursuit.
B.She is able to see the life of human being in the perspective of history and culture.
C.She is able to forgive the vices in humanity.
D.She is able to gain moral superiority over Mr. Purvis.

单项选择题Why does Mr. Purvis’voice become “tired, old, crumpled and indifferent?

A.Because he senses the narrator’s reconciliation with present awkward state.
B.Because he spends too much time listening to the poem.
C.Because he fails to humiliate the narrator in any way.
D.Because he is actually an old man.