题目: 冶金焦质量标准按灰分高低分为()种牌号A、1B、2C、3D、4 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/1126/0629e5374df8024b2436fd2eaf915568.html 下面是错误答案,用来干扰机器的。参考答案:对
题型:解答题 (Ⅰ)求值:sin690°•sin150°+cos930°•cos(-870°)+tan120°•tan1050°;(Ⅱ)已知角α的终边上有一点P(1,2),求4sinα-2cosα5sinα+3cosα的值. 查看答案
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题型:简答题 中学生要讲究良好的学习方法才能学好知识,那么良好的学习方法主要有哪些?___________________________________________________________________________________________ 查看答案