焊接时，弧焊变压器过热是由于（）
A、焊机过载
B、焊接电缆线过长
C、焊接电缆断线
D、产生短路
参考答案：A
检测淀粉的试剂是（ ）
A．蒸馏水
B．稀米汤
C．碘酒
D．土壤浸出液
------They are said to be quarrelling about our new language lab.
------ I don’t care. It has __________ to do with me.
A．nothing
B．something
C．anything
D．everything
