如图,开关S闭合,通电螺线管的左端是极,要使它的磁性增强,可将滑片P向端移动。 发布时间:2017-06-18 16:08 │ 来源:www.tikuol.com 题型:填空题 问题: 如图,开关S闭合,通电螺线管的左端是 极,要使它的磁性增强,可将滑片P向 端移动。
题型:填空题 Studies show that people are more ________ to suffer from back problems if they always sit before computer screens for long hours. [ ]A. likely B. possibleC. probable D. sure 查看答案