四十九亿七千万写作______,省略亿后面的数,约是______亿.
四十九亿七千万写作:4970000000;
4970000000≈50亿.
故答案为:4970000000,50.
The board are discussing the possible _____ they can take of the present economic situation.
A.notice
B.advantage
C.use
D.best
间接碘量法中淀粉指示剂的加入时间根据个人习惯而定。( )