文学 数字证书 释 digital certificate 数字证书 经证书授权中心（Certification Authority，CA）数字签名的包含公开密钥拥有者信息以及公开密钥的电子文档。CA是权威、可信赖、公正的第三方机构，专门负责为各种认证需求提供数字证书服务。
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- angular path length
- angular point
- angular position transducer
- angular power spectrum
- angular quantum number
- angular rate sensor
- angular resolution
- angular resolved photoemission
- angular resolved photoemission spectroscopy
- angular resolved photoemission spectroscopy, ARPES
- angular resolving power
- angular scale
- angular second
- angular semi-major axis
- angular semi-minor axis
- angular separation
- angular size
- angular spectrum
- angular speed
- angular torus
- angular transformation
- angular unconformity
- angular variable
- angular velocity
- angular velocity matching