脚手架应经常检查,在大风、暴雨后及解冻期应加强检查。()脚手架,在恢复使用前应经检查鉴定合格后,方可使用
参考答案:长期停用的
视神经鞘脑膜瘤()。
A.CT显示"轨道征"
B.B超显示呈"对吻状"
C.B超显示"慧尾征"
D.CT显示"钙斑"
E.B超显示呈"挖空征"
The major technical areas of computer security are usually represented by the initials CIA: (66) , integrity, and authentication or availability.
A.confidentiality
B.confident
C.secret
D.safety