频率副词有哪些?
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always(总是),usually(通常),frequently(经常) often (经常)sometimes(有时),seldom(不常),rarely(极少),never(从不) once(一次),twice(两次),等.
all the time 100%;
almost ,always 90%;
generally ,usually 80%;
often ,frequently 60-70%;
as often as not 40-50%;
sometimes ,at times 20-30%;
occasionally ,from time to time 10%;
hardly ,seldom ,rarely 5%;
never 0%.
all the time 100%;
almost ,always 90%;
generally ,usually 80%;
often ,frequently 60-70%;
as often as not 40-50%;
sometimes ,at times 20-30%;
occasionally ,from time to time 10%;
hardly ,seldom ,rarely 5%;
never 0%.
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海德声科贸易(上海)有限公司
2018-03-18 广告
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噪声是指音高和音强变化混乱、听起来不谐和的声音。是由发音体不规则的振动产生的,从物理学的角度来看:噪声是发声体做无规则振动时发出的声音,在一定环境中不应有而有的声音。泛指嘈杂、刺耳的声音。从环境保护的角度看:凡是妨碍到人们正常休息、学习和工...
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