公钥基础设施(Public Key Infrastructure,PKI)是一个用非对称密码算法原理和技术来实现并提供安全服务的具有通用性的安全基础设施。
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You can always rely ________ Peter to be on time for meetings.
A. around
B. on
C. at
D. of
I think you’re capable ________ getting really good grades if you work hard.
A. of
B. by
C. in
D. over
Seeing the car accident had a huge ________ on the rest of his life.
A. enough
B. effort
C. effect
D. explain
She’s missed a lot of work, but I’m sure she’ll be able to ________ up.
A. get
B. catch
C. take
D. make