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fricative

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place of articulation

水利水电工程的金属结构的类型主要有______。

A. 闸门
B. 拦污栅
C. 清污机
D. 发电机
E. 启闭机

Stops, fricatives, affricates, liquids, and glides all have some degree of o and are therefore consonants.

One mark of an informal style is the frequent occurrence of s words and expressions, which make sense only to the people of particular social groups and serve as a mark of membership and solidarity within a given social group.