问题
选择题
September is ______ month of the year. [ ]
A.ninth
B.the ninth
C.the nineth
答案
答案：B
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September is ______ month of the year. [ ]
A.ninth
B.the ninth
C.the nineth
答案：B
=0.86，负载系数KL，=0.9。问如何选择熔断器进行保护？