---She’s seldom asked to do housework at home,        she?

---      . Her parents are very busy with their work, so she has to do the laundry every day.

A．has; Yes

B．hasn’t; No

C．is; Yes

D．isn’t; No

电机转轴粗车时的注意事项是( )。

A．应采用强力切削

B．车刀应有较小的散热面

C．应切除轴坯的全部加工余量

D．车刀应是铁制的