现代柴油机动力装置的发展，在低油耗方面已非追逐的主要目标，代之以______成为重大研究课题
A
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Whatarethecharacteristicsofgoodwritings?
Theprofessoraskedaquestion,andDavid________agoodanswer.
Lookatthisgroupofpeople______beachvolleyball.
Shehasnohostilitytous,_____canbejudgedfromhereyes。
Itisdifficultto________theimplicationbetweenthelines.
