据统计，全球每分钟约有8500000吨污水排入江河湖海，则每分钟的排污量用科学记数法表示应是（ ）吨。
8.5×106
There ____ a stamp collection show in the museum this afternoon. [ ]
A. is
B. is going to have
C. has
D. is going to be
减轻开关触头烧损的主要措施是什么？
