皮皮学，免费搜题
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【单选题】
目前，安全认证系统主要采用基于( )的数字证书来实现。A.
PKI
B.
KMI
C.
VPN
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
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A.
Are; they are
B.
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C.
Does; she does
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【单选题】—What's the matter? —_____. [ ]
A.
I have fever
B.
I am fever
C.
I am a fever
D.
I have a fever
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