问题 计算题 用竖式计算。(1)75+15=(2)66-38=(3)91-24-33=(4)89-56+27= 答案 (1) 75 + 15 90(2) 66 - 38 28(3) 91 - 24 67 - 33 34(4) 89 - 56 33 + 27 60 选择题 As tensions flared this week between China and Japan over the Diaoyu Islands in ________ East China Sea, ________ senior US State Department official said the United States wants cooler heads to prevail.A.the; theB./; theC./; aD.the; a 查看答案 问答题 简答题 所有矿井都必须采用什么通风? 查看答案