A. 2012年河北省计价规范中规定钢筋定尺长度,下列叙述正确的是( )。 B. 直径10mm以上者,按12m长一个接头 C. 直径25mm以上者,按6m长一个接头 D. 直径25mm以上者,按9m长一个接头 E. 直径10mm以上至25mm以内者,按10m长一个接头 F. 直径25mm以内者,按8m长一个接头
【单选题】The fifth generation computers, with artificial intelligence,___ and perfected now. A. developed B. have developed C. are being developed D. will have been developed