ZD6系列电动转辙机自动开闭器的速动爪滚轮不能正常滚动的原因之一：滚轮内径和滚轮轴的 发布时间：2020-02-09 06:02 │ 来源：www.tikuol.com 题型：单项选择题 问题： ZD6系列电动转辙机自动开闭器的速动爪滚轮不能正常滚动的原因之一：滚轮内径和滚轮轴的粗糙度达不到要求，有毛刺或杂物，加大（）。A.重力B.压力C.摩擦力D.阻力
题型：单项选择题 — Do you want a lift home? — It's very kind of you, but I have to work late in the office. I overslept this moming because my alarm clock _____.A. doesn't go off B. won't go offC. wasn't going off D. didn't go off 查看答案