[问答题]
d. The uncertainty of the mass and of the time are shown. Suggest how theseomb :b /7xac wctye21tivps-9 r-.,uk uncesvb.xcor1 m u -c9, a7pb-k /:it2weyt;;qkhe *oyq/ lry. xs7po5.sirtainties could be shownp;.; r75y*ixeos qqy.os lh/k on the trend lines.