阅读下面的诗文，回答相关问题。

                                                                                                          《饮酒》
                                                                                                            陶渊明

                                                                                             结庐在人境，而无车马喧。
                                                                                             问君何能尔，心远地自偏。
                                                                                             采菊东篱下，悠然见南山。
                                                                                             山气日夕佳，飞鸟相与还。
                                                                                              此中有真意，欲辩已忘言。

结合上述材料，回答下列问题：

在紧急情况下，可以少量接受A型或B型血，该受血者的血型是（　　）

有一个角是锐角的三角形,叫做锐角三角形．