开音节?绝对开音节?相对开音节?我的神啊ago ,bus ,bar ,bow他们是什么音节?

这是语音学家级别的题目：
ago的go是绝对
bus是闭音节
bar是r-音节
bow是第五类音节
没有相对的.这些概念在英文文献中都很少使用了.
There are six different kinds of syllables in English:
Closed Syllables:A closed syllable has one and only one vowel,and it ends in a consonant.Examples include in,ask,truck,sock,stretch,twelfth,and on.
Open Syllables:An open syllable has one and only one vowel,and that vowel occurs at the end of the syllable.Examples include no,she,I,a,and spry.
Silent-E Syllables:A silent-e syllable ends in an e,has one and only one consonant before that e,and has one and only one vowel before that consonant.Examples include ate,ice,tune,slope,strobe,and these.
Vowel Combination Syllables:A vowel combination syllable has a cluster of two or three vowels or a vowel-consonant unit with a sound or sounds particular to that unit.Examples include rain,day,see,veil,pie,piece,noise,toy,cue,and true.
Vowel-R Syllables:A vowel-r syllable is one which includes one and only one vowel followed by an r,or one vowel followed by an r which is followed by a silent e,or a vowel combination followed by an r.Examples include car,or,care,ire,air,and deer.
Consonant-L-E Syllables:In these syllables,a consonant is followed by le.The vowel sound in these syllables is the schwa sound that occurs before the l.Examples include -ble,-cle,-dle,-fle,and -gle.
祝进步.
Friederich,W.P.(1958/1960).English Pronunciation:The Relationship between Pronunciation and Orthography英语读音规则与拼法 (R.A.Martin & 缪廷辅,Trans.).London,UK; Beijing,China中国北京:Longmans,Green & Co Ltd.; The Commercial Press商务印书馆.