检验变压器线圈绝缘老化程度时。用手按不裂、不脱落,色泽较暗,绝缘合格,此绝缘是()绝 发布时间:2017-07-12 21:21 │ 来源:www.tikuol.com 题型:单项选择题 问题: 检验变压器线圈绝缘老化程度时。用手按不裂、不脱落,色泽较暗,绝缘合格,此绝缘是()绝缘。A、一级;B、二级;C、三级;D、四级。
题型:单项选择题 We ______ 1000 English words since we ______ to this school. [ ]A. learn, come B. have learning, came C. have been learning, came D. have learned, come 查看答案