【单选题】They were late for class for there was a ______ in the traffic.
【判断题】中性点非有效接地系统发生单相稳定电弧接地时,可能产生电弧接地过电压。
【简答题】男性生殖腺是,女性生殖腺是。精子由小管产生,雄激素由细胞产生。
【单选题】保证全党服从中央坚持党中央权威和集中统一领导,是党的政治建设的()。
【简答题】The number of right-handed mothers who hold the baby on the left side exceeds that of left-handed ones by 22%.
【判断题】中性点非有效接地系统发生单相稳定电弧接地时,可能产生电抓接地过电压。