【简答题】A.Forbidding students to take food out of the restaurant. B.Requesting customers to pay before taking the food. C.Asking customers to leave their bags on the counters. D.Allowing only two students to ...
【简答题】(本小题满分10分) 如图14①至图14④中,两平行线 AB 、 CD 音的距离均为6,点 M 为 AB 上一定点. 思考:如图14①中,圆心为O的半圆形纸片在AB、CD之间(包括AB、CD),其直径MN在AB上, MN =8,点 P 为半圆上一点,设∠ MOP = α ,当 α =________度时,点 P 到 CD 的距离最小,最小值为____________. 探究一在图14①的基础上,以...