问题 名词解释

喷油提前角

答案

参考答案:喷油时曲轴的曲拐位置与压缩行程结束而活塞在上止点时曲拐位置之间的夹角,称为点火提前角

图说历史

       上面两幅历史照片反映的外交事件是什么?并简要说说周恩来在这两个事件中对新中国外交作出的贡献。

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

多项选择题 案例分析题