枕先露临产后肛查了解胎头下降程度的标志为
A.骶岬
B.耻骨联合后面
C.坐骨棘
D.坐骨结节
E.坐骨切迹
参考答案:C
There _____ be any difficulty in passing the road test since you have practiced a lot in the driving school. [ ]
A. shan't
B. shouldn't
C. mustn't
D. needn't
在使用复杂度不高的口令时,容易产生弱口令的安全脆弱性,被攻击者利用,从而破解用户帐户,下列()具有最好的口令复杂度。
A.morrison
B.Wm.$*F2m5@
C.27776394
D.wangjingl977