旧石器时代的

Ruyu Jiaquantian meng Ruins 2 years ago about "advanced Homo sapiens" fossils of human bones; Qian'an Zhaocun Village Ruins 40,000 years ago if the tooth's edge as the ancient ivory and human used to sew the late Paleolithic clothing of bone needles, bone cone; move posts MA solitary village unearthed bamboo with close ties to the state-owned "The Double" and "bo ding "; Qian'an Liao Dynasty unearthed in white, is a boutique Ancient.

如玉田孟家泉遗址出土距今2万年左右的&晚期智人&的人骨化石；迁安爪村遗址出土距今4万多年的若氏古棱齿象象牙及旧石器时代晚期人类用来缝制衣物的骨针、骨锥；迁安马哨村出土的与孤竹国有密切联系的&其簋&和&卜鼎&；迁安出土的辽代白瓷，堪称古瓷精品。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。