10KV线路首端发生金属性短路故障时,()保护动作,断路器跳闸。
A、过电流
B、速断
C、按频率降低自动减负合
参考答案:B
当实际利率大于零时,反映( )。
A.名义利率高于通货膨胀率
B.名义利率低于通货膨胀率
C.名义利率低于零
D.名义利率等于零
There is a widespread belief among the science world ____ we keep on _____ the earth as we are doing today,
the exist ence of us humans on this planet will be out of the question in some years yet to come.[ ]
A. if; polluting
B. if; to pollute
C. that if; to pollute
D. that if; polluting