The schedule, originally_____out last week, had to be cancelled because of the unexpected snow storm.

A．carried

B．to be carried

C．being carried

D．was carried

韶山9型电力机车同一轴上各个轮荷重和两个轮平均轮荷重之差，不超过平均轮重的（）。

A.±4％

B.±6％

C.±8％

D.±10％