新轮的直径是840毫米,磨损后的车轮直径限值是770毫米。
参考答案:对
盐酸与块状碳酸钙固体反应时,不能使反应的最初速率明显加快的是( )
A.将块状碳酸钙固体换成粉末状固体
B.盐酸的量增加一倍
C.盐酸的用量减半浓度加倍
D.温度升高40°C
New York City surpassed the other Atlantic seaports in partly because it developed the best transportation links with the interior of the country.
A.part
B.partial
C.partner
D.parting