选择题:轴环的作用是( ) 题目分类:华北水利水电大学-机械设计基础 题目类型:选择题 查看权限:VIP 题目内容: 轴环的作用是( ) A.加工轴时的定位面 B.提高轴的强度 C.使轴上零件获得轴向定位 D.以上都不对 参考答案:
Nearly 3,000 people were killed in the 911 attack. Nearly 3,000 people were killed in the 911 attack.选择一项:对错 分类:华北水利水电大学-机械设计基础 题型:选择题 查看答案
– Hello, may I speak to John?– ___________________ – Hello, may I speak to John?– ________________________选择一项:A. Can I leave a mes 分类:华北水利水电大学-机械设计基础 题型:选择题 查看答案
This plant can.t be exposed ____________strong sun This plant can.t be exposed ____________strong sunshine.选择一项:A. inB. to C. by 分类:华北水利水电大学-机械设计基础 题型:选择题 查看答案
When Lily came home at 5 pm yesterday, her mother When Lily came home at 5 pm yesterday, her mother ______dinner in the kitchen.选择 分类:华北水利水电大学-机械设计基础 题型:选择题 查看答案