--- What’s _________ , Mary?   --- I have  _________.

A．the wrong, a stomachache

B．wrong, a stomachache

C．matter, a stomach

D．trouble, stomachache

钢筋采用机械锚固时，锚固长度范围内箍筋不小于（）个

A、2

B、3

C、5

D、10