一袋面粉重25千克，食堂买了8袋面粉，一共重多少千克？
25×8=200（千克）；
答：一共重200千克．
Although it doesn't look like＿，the entire cathedral is made of wood.
A．it
B．that
C．this
D．such
拱顶油罐充气顶升，在一般情况下，顶升预定时间取（）为宜。
A.20-40min
B.50-70min
C.70-80min
D.80-90min
