單項(xiàng)選擇題ZYJ4電液轉(zhuǎn)轍機(jī)+SH5轉(zhuǎn)換鎖閉器正常動(dòng)作時(shí)間是()

A.≤5S
B.≤7.5S
C.≤10S
D.≤30S


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