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【判断题】
在电子商务中,交易双方可能远隔万里而互不相识,所以人们需要用一个电子签名机制来相互证明各自的身份。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】广东省共()个县级行政区,包括()个市辖区,()个县级市,()个县,()自治县。
A.
121 64 20 34 3
B.
101 87 23 43 5
C.
123 85 32 25 6
D.
133 68 21 35 3
【单选题】He was elected______ president of the company, and _____news came ,in fact, as ______surprise.
A.
a; the ;X
B.
X; the ; a
C.
a; X; the
D.
the; the; a
【单选题】In fact, American people came to love Adams ____________.
A.
whether he was president or not
B.
when he was not a president
C.
before his term ended
D.
when he first became a representative