电缆及()接地前应逐相充分放电。
A.电容器
B.断路器
C.隔离开关
D.变压器
参考答案:A
The disaster-stricken village was inaccessible _______ by helicopter, and the storm added to the rescuers’ difficulty.
A.instead of
B.other than
C.rather than
D.regardless of
疑为颅内动脉瘤破裂出血引起的蛛网膜下腔出血(SAH),选择哪段时间进行造影并发症最少()
A.5小时内效果最佳
B.1~3天内
C.3~7天
D.1~2周
E.2周以上