2的倒数是﹙ ﹚；一个数的绝对值是3，则这个数是﹙ ﹚．
；±3．
Kate ________ on her new novel, which is supposed to come out next month.
A．has been working
B．had worked
C．will be working
D．was working
通信设备的维护检修规定中，设备有哪些？
；±3．
；±3．