单项选择题
A.1% B.2% C.3% D.4%
A.1/1000 B.1/100 C.1/150 D.1/50
A.终端杆B.转角杆C.直线杆D.跨越杆
A.1/2 B.1/3 C.1/4 D.1/5
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