用钢卷尺测定油罐中油的高度读数时视线应和液面（）。
A、俯视
B、仰视
C、平视
D、斜视
参考答案：C
As nobody here knows what is wrong with the machine, we must send for an engineer to ____ the
problem. [ ]
A. handle
B. raise
C. face
D. present
125×3200×103×25=( )。
A．103 000000
B．1 030000000
C．1 030000
D．10 300000000
