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【单选题】
【2019上】用户A和B要进行安全通信,通信过程需确认双方身份和消息不可否认。A和B通信使用( )来对用户的身份进行认证。A.
数字证书
B.
消息加密
C.
用户私钥
D.
数字签名
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反馈参考答案：
举一反三
【单选题】existing very commonly or happening frequently
A.
assign
B.
submarine
C.
prevalent
D.
explicitly
【简答题】A．traditional. B．more melodic. C．very repetitive. D．commonly played.
【单选题】What are very commonly used teaching procedures and stages?
A.
Presentation, practice and production
B.
Pre-reading, while-reading and post-reading
C.
Mechanical practice and meaningful practice
D.
Both A and B
【单选题】患者男性,28岁,因外出春游出现咳嗽.咳白粘痰伴喘息1天入院,体检:体湿36.5°C,脉搏90次/分,呼吸28次/分,血压120/80mmHg,在肺部可闻及广泛哮鸣音,既往有哮喘史。该病人哮喘发作最可能的诱因是
A.
花粉
B.
尘螨
C.
动物的毛屑
D.
病毒感染
【单选题】A unit price contract is very commonly used for ( )
A.
a tunnel
B.
school buildings
C.
an apartment building
D.
a hospital
【简答题】Very __________ is a specialist capable of being an administrator. [A] commonly [B] scarcely [C] rarely [D] hardly
【单选题】What are very commonly used teaching stages?
A.
PPP
B.
PWP
C.
Mechanical practice and meaningful practice
D.
Both A and B
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