<p><span style="color: rgb(68, 68, 68); font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', 'Helvetica Neue', Arial, sans-serif; font-size: 16px; letter-spacing: 0.5px; line-height: 26px; background-color: rgb(255, 255, 255);">消除了岷江水患,使成都平原变得“水旱从人,不知饥馑”,因而获得了“天府之国”的美称。</span></p>
<p><span style="color: rgb(68, 68, 68); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 16px; letter-spacing: 0.5px; background-color: rgb(255, 255, 255);">思想变革:思想空前活跃,各学派形成“百家争鸣”的学术繁荣局面。</span></p>
<p><span style="color: rgb(68, 68, 68); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 16px; letter-spacing: 0.5px; background-color: rgb(255, 255, 255);">思想变革:思想空前活跃,各学派形成“百家争鸣”的学术繁荣局面。</span></p>
<p><span style="color: rgb(68, 68, 68); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 16px; letter-spacing: 0.5px; background-color: rgb(255, 255, 255);">.春秋战国时期是我国历史上的大变革时期。变革具体表现在:①工具变革:铁农具和牛耕广泛使用,生产力显著提高。②制度变革:各国通过变法,确立封建制度(最能反映大变革本质的)</span></p>
<p><span style="color: rgb(68, 68, 68); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 16px; letter-spacing: 0.5px; background-color: rgb(255, 255, 255);">战国是我国封建制度的确立时期</span></p>
<p><span style="color: rgb(68, 68, 68); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 16px; letter-spacing: 0.5px; background-color: rgb(255, 255, 255);">战国时期,秦国蜀郡太守李冰,在岷江中游修筑的都江堰,是举世闻名的防洪灌溉工程。消除了岷江水患,使成都平原变得“水旱从人,不知饥馑”,因而获得了“天府之国”的美称。</span></p>
<p><span style="color: rgb(68, 68, 68); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 16px; letter-spacing: 0.5px; background-color: rgb(255, 255, 255);">1.春秋时期,我国开始出现铁农具。春秋末年,我国已使用牛耕,战国进一步推广。牛耕是我国农业发展史上的一次革命,铁农具和牛耕的推广,使土地利用率和农作物产量显著提高。</span></p>