铝及铝合金焊丝根据化学成分可分成纯铝、铝镁、铝铜、铝锰及铝硅几大类。
Howmanypartsdoesascienceandtechnologypaperconsistof?Whatarethey?
WhatisIrelandcalledinIrish?
Itisdifficultto________theimplicationbetweenthelines.
英语翻译：他是公司的首席执行官,但总是平易近人。
Notuntilrecently_____thatThompsonhadbentellingthetruthallalong.
