当被测电流是未知数时，万用表的测量量程应由大到小进行变换。（）
参考答案：对
Instead of calling ___ his uncle, he called ___ my new house with his wife that day.
A．by ,for
B．on, at
C．for, on
D．at, by
管材上有矫直和车削痕迹、氧化色、发暗、细划痕、水迹和油迹，要进行报废处理。( )
