People living in cold climates prefer to use  warm clours   a warm and comfortable feeling there.

A．to create

B．to creating

C．creates

D．create

3台单相电焊机铭牌数据如下：Un=380V，Pn=30kW，εn=60％，cosα=0．6。求该电焊机组的Pjs(计算推荐需用系数KX取0．35)。