非金属垫片标注为“HG20606垫片RF-E100-2.5XB450/304”其中“ 发布时间:2019-08-03 16:00 │ 来源:www.tikuol.com 题型:单项选择题 问题: 非金属垫片标注为“HG20606垫片RF-E100-2.5XB450/304”其中“RF-E”表示()。A.突面B.突面包边C.平面包边D.内包边
题型:单项选择题 ---Your father’s never been to other countries, has he? --- ________. He plans to go abroad for a second time.A.No, he hasB.Yes, he hasn’tC.Yes, he hasD.No, he hasn’t 查看答案