逆变站接至不同远端交流站或逆变站的交流出线多于()回时,不设置最后断路器保护。
A.1
B.2
C.3
D.4
参考答案:B
The policeman helped the boy ______ the hotel the day before yesterday.[ ]
A .found
B. find
C. finds
D. finding
穿透电流越大,三极管越好。()