写出STM-N信号速率的计算公式()。
参考答案:270×9×N×8000×8bit/s
Men are equally as good as women at taking care of others; better ________, male nurses can be a great help in keeping patients still while they receive painful treatment.
A.yet
B.much
C.enough
D.even
企业的无形资产都应在规定的期限内进行摊销。 ( )