将E-R图转换为关系模式时,E-R图中的属性可以表示为( )。
A、属性
B、键
C、关系
D、域
盘必须存放在远离电视机、监视器等地方,因为这些物体能够产生—定的()。
A、电场
B、磁场
C、灰尘
D、温度
下面属于应用软件的是( )。
A、学生成绩管理系统
B、UNIX操作系统
C、汇编程序
D、编译程序
In JUNOS software, which type of VPN supports IPX and Appletalk?()
A、Martini based VPNs
B、2547bis based VPNs
C、Sham link based VPNs
D、Virtual Router based VPNs
During Company.com planning session,Company.com presents the details of the current Network design. The network design serves four separate company facilities, each on as separate subnet. As part of a disaster recovery plan, the customer is evaluating the use of HACMP. Specifically, the have reviewed IPAT via IP aliasing and are questioning the number of IP subnets required. Given the customer’s current configuration,what is the recommended minimum number of IP subnets that would be required?()
A、 4
B、 5
C、 6
D、 8
患者,女性,28岁,咳嗽两个月,干咳为主,有午后低热,月经不规律。胸片示右上肺淡片状阴影。为进行诊断,进行了PPD试验。关于PPD试验结果的判断,下列哪项是正确的()
A、硬结直径≤5mm为阳性
B、硬结直径5~9mm为阳性
C、硬结直径≤10mm为阳性
D、硬结直径10~19mm为阳性
E、局部有水疱为阳性