公钥基础设施PKI是一个能完成用户的管理、密钥的分发、仲裁认证等一系列的工作基础平台。()
查看答案
The word "currency"(line 2, para. 2)most probably means "______".
A. money
B. prevalence
C. codec
D. understanding
According to the text, researchers disagree over______.
A. the existence of emotional intelligence
B. the importance of aptitude testing
C. how to measure emotional intelligence
D. whether or not accounting is important to the study of emotional intelligence
在要求供电可靠性较高的工厂供电系统不宜采用:()
A 熔断器保护
B 低压断路器保护
C 低压自动开关保护
D 继电保护
微信支付 
支付宝支付