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L-Girl
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我的简介
- valve
- (http://www.valve-type.blogspot.com) A valve is a mechanism which changes the length of the tube, or body of a wind instrument; it allows you to play a wider range of notes. A piston valve features a that moves up and down in a casing; a rotary valve changes the air passage by means of a rotor activated by a lever. in the blog we will introduce many different types of valves to you. the basic valve types can be divided into two general groups: stop valves and check valves.
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