During the period of ______ from oil heat to gas heat the furnace will have to be shut off

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During the period of ______ from oil heat to gas heat the furnace will have to be shut off.

A.transfer

B.transmission

C.transition

D.transportation

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。