搜题请搜索小程序“爱下问搜题”
问题 单项选择题

下列药品中，显影或定影液都用的是

A．明矾

B．冰醋酸

C．溴化钾

D．亚硫酸钠

E．碳酸钠

答案

参考答案：D

解析：亚硫酸钠为显、定影液都有的成分，在显影液中作为保护剂防止氧化，延长显影液的使用寿命；在定影液中的作用是防止硫代硫酸钠的遇酸分解。

单项选择题

To compete in today’s fast-paced competitive environment, organizations are increasingly allowing contractors, partners, visitors and guests to access their internal enterprise networks. These users may connect to the network through wired ports in conference rooms or offices, or via wireless access points. In allowing this open access for third parties, LANs become ___19___. Third parties can introduce risk in a variety of ways from connecting with an infected laptop to unauthorized access of network resources to ___20___ activity. For many organizations, however, the operational complexity and costs to ensure safe third party network access have been prohibitive. Fifty-two percent of surveyed CISOs state that they currently use a moat and castle’s security approach, and admit that defenses inside the perimeter are weak. Threats from internal users are also increasingly a cause for security concerns. Employees with malicious intent can launch ___21___ of service attacks or steal ___22___ information by snooping the network. As they access the corporate network, mobile and remote users inadvertently can infect the network with ___23___ and worms acquired from unprotected public networks. Hackers masquerading as internal users can take advantage of weak internal security to gain access to confidential information.

23（）

A．sickness

B．disease

C．germs

D．viruses
查看答案
单项选择题 A1/A2型题

当t-PSA在4.0～10.0μg/L时，f-PSA/t-PSA比值为可作为（），前列腺肥大和前列腺癌的鉴别点。

A.0.05

B.0.11

C.0.25

D.0.35

E.0.45
查看答案