[英语语音过关双元音歌]美国英语的双元音有九个： 合口双元音/e o aɪ aʊ ɔɪ/ /e/ 合口双元音，由/ɛ/和/ɪ/两个单音组成，前重后轻，口型由介于半开半合之间向半合接近，元音字母a在重读开音节，重读相对...+阅读

好 哒 哋 汸

嘟 哊 哄 哃 点

木急 碇 ，芢 哆

gdy.baidu/.ie-d.net?daems

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切削刃附近的前刀面上会出现一块堆积物，代替切削刃工作，把这个堆积物称为积屑瘤.

(2)由于积屑瘤会改变刀具工作时的实际前角，

(3)当其变化与脱落时，又会影响已加工表面粗糙度、刀具磨损等.

(4)因而积屑瘤也常作为切削时一个重要物理现象进行研究.化学性质与工件材料相同；

(5)与前刀面粘结牢固；消失或脱落具有一定的临界切削温度；不稳定，成长、脱落反复进行.

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