仪表管路中的导压管至一次仪表的距离一般不超过( )。
A.12m
B.16m
C.18m
D.20m
参考答案:C
总成本不包括()。
A.获取成本
B.处置成本
C.作业成本
D.销售成本
—How was your Children's Daylast year?
—Great! We _____ some books to the Hope School in that village that day.[ ]
A. are sending
B. sent
C. will send
D. send