A new study shows older men          a lack of deep sleep are nearly twice as likely to develop high blood

pressure.[ ]

A. suffering for  

B. who is suffering    

C. who suffer from  

D. who suffer to

施工现场送、停电的操作顺序是：送电时，总配电箱→分配电箱→开关箱；停电时，开关箱→分配电箱→总配电箱。