The survey_________in our school last month shows that about 2 percent of the students are addicted to Internet games.

A．conducting

B．having been conducted

C．conducted

D．to be conducted

刻痕钢丝是将碳素钢丝表面沿长度方向压出椭圆形刻痕后，成盘的刻痕钢丝需要做( )。

A．高温淬火

B．高温回火

C．低温回火

D．低温淬火