依据《中国电信LTE无线网络厂家网管技术要求》，网管系统的全指标测M周期应能支持缺省默认（）分钟。
A.1
B.15
C.30
D.60
参考答案：B
---You are devoted herself_____ to her research and it earned her a good reputation in her field.
A．strongly
B．extremely
C．entirely
D．freely
19．He says he really can’t _____ to wait another day．
A．waste
B．afford
C．spare
D．Pay
