制冷剂钢瓶内充注制冷剂液体,最多可占到钢瓶容积的90%。() 发布时间:2018-05-08 04:37 │ 来源:www.tikuol.com 题型:判断题 问题: 制冷剂钢瓶内充注制冷剂液体,最多可占到钢瓶容积的90%。()
题型:判断题 —Who_______the telephone?—Alexander Graham Bell, an English inventer.[ ]A. found B. discovered C. invented D. created 查看答案