开拆邮袋时,应当剪断绳扣()股。A.1 B.2 C.3 D.4 发布时间:2017-12-02 22:51 │ 来源:www.tikuol.com 题型:单项选择题 问题: 开拆邮袋时,应当剪断绳扣()股。A.1B.2C.3D.4
题型:单项选择题 ________ the opportunity to speak at the graduation ceremony made him overjoyed.A.Being offeredB.To offerC.Having offeredD.Offered 查看答案
题型:单项选择题 图示结构受力作用,若把力作用点D沿其作用线传动到E点,则铰链支座A、B和铰链C的约束力为()。A.A、B、C的约束力都不改变B.A、B、C的约束力都要改变C.A、B约束力不变,C的约束力改变D.A、B约束力改变,C的约束力不变 查看答案