6502电气集中在12线上串接QJJ第二组接点的作用是（）。
A、防止提前解锁
B、防止道岔中途转换
C、防止迂回电流
D、保证供电
参考答案：C
Quebec, once originally ______ by France, ______ the British in 1763.
A．being colonized; was lost in
B．was colonized; was lost to
C．colonized; was lost to
D．having being colonized; was lost in
绝缘保护绳有（）两类。
A.人身绝缘保护绳；
B.两眼绝缘绳；
C.无极绝缘绳；
D.导线绝缘保护绳。
