内燃机的做功冲程发生在( )之后,膨胀功经连杆由曲轴输出,从而把燃料的热能转换为机 发布时间:2018-01-08 17:51 │ 来源:www.tikuol.com 题型:单项选择题 问题: 内燃机的做功冲程发生在( )之后,膨胀功经连杆由曲轴输出,从而把燃料的热能转换为机械动。A.进气冲程B.压缩冲程C.膨胀冲程D.排气冲程
题型:单项选择题 What made the archeologist feel excited was that he finally found two ancient vases in ______ seemed to him to be a king’s bedroom.A.thatB.whatC.whereD.which 查看答案
题型:单项选择题 颌骨囊肿X线表现A.下颌骨体有大小不等的多房阴影B.下颌骨内有单房透明阴影,四周有白色骨质线C.颌骨内虫蚀状骨质破坏区,四周骨质可有破坏D.下颌角见骨质疏松脱钙,并有骨质增生E.下颌骨体有骨质破坏,并有死骨形成 查看答案