题目内容
In the production of v______ sounds, the passage of the airstream is relatively unobstructed; we have no blockage of the air as it is pushed out of the lung.
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A___________ phonetics studies how the listeners perceive the sounds.
Of the three branches of phonetics, the longest established and until recently the most highly developed, is articulatory phonetics.
A diphthong is a sequence of two sounds: a vowel plus a glide.
关于灾害的定义，不正确的是（）
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