头痛伴短暂视力减退的是（）
A.偏头痛发作
B.椎-基底动脉供血不足
C.小脑肿瘤
D.一氧化碳中毒
E.癔症性头痛
参考答案：B
1～10KV架空线路与建筑物的垂直距离不应小于（）。
A、1m
B、2m
C、3m
D、4m
But for the help of my English teacher, I the first prize in the English Writing Competition.
A．would not win
B．would not have won
C．would win
D．would have won
