We want such materials  ________ can bear high temperature and pressure.

A．that

B．as

C．what

D．which

绞窄性腹股沟斜疝，因肠坏死而行肠切除、吻合术后，对于疝的治疗应采取

A．单纯疝囊高位结扎术
B．Ferguson法疝修补术
C．Bassini法疝修补术
D．无张力疝修补术