CRH1A型动车组手动打开上脚踏进行维护作业时,必须关闭供风塞门,插入()防止脚踏意 发布时间:2019-09-25 04:02 │ 来源:www.tikuol.com 题型:单项选择题 问题: CRH1A型动车组手动打开上脚踏进行维护作业时,必须关闭供风塞门,插入()防止脚踏意外收回。A.专用螺丝刀B.电源C.安全弹簧D.安全插销
题型:单项选择题 The little elephant is afraid to go alone.He always walks _________ his mother.A.besidesB.besideC.below D.under 查看答案