铁路轨距变化应和缓平顺,允许速度不大于120km/h的其他站线,轨距变化率不得大于()(不含规定的递减率)。
A.1‰
B.2‰
C.3‰
D.4‰
参考答案:C
____________ people went to the concert which was held in People’s Square the night of May Day.
A.Three thousand, in
B.Thousands, on
C.Many thousand, in
D.Thousands of, on
2,3,4,9,32,( )
A.47 B.83 C.128 D.279