溶解于铜的杂质以硫对铜的导电率影响最大。
错误
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-DidyouhearthatJohnlosthisjob?
-It_______thathehadmadesomeseriousmistakesinhiswork.
Myfatherisareporter.Heworksina___________.
Momaskedmeto_____________grandpawhenshewasout.
为了弘扬传统文化,学校准备修建文化墙,向同学们征集建议。请从图6中任选一幅推荐给学校,运用所学知识写出推荐理由。
-Howcanwehelpthechildreninthemountainvillage?
-Wecan_______leafletstoaskpeopletodonatemoney.