一天有86400秒,用科学记数法表示为( )秒。
如果一张硬盘载有几个保管理期限不同的会计档案文件,应按( )期限的文件保管。
A.最短B.平均C.最长D.中间
He always asks _______ questions! I don't like him at all.[ ]
A. too many
B. too much
C. many too
D. much too