区别下列两组短语，证明它们各自的特点.（1）读三遍——读三篇（2）明天春节——明天完成
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任何一个有源二端线性网络，都可以用一个等效电压源来代替，这个等效电压源的电动势等于该二端网络的（）。
A. 短路电压
B. 开路电压
C. 通路电压
You need to design security for messages exchanged between Northwind Traders employees and its vendors. What should you do？（）
A. Require employees to access e-mail only over connections that use SSL
B. Place Exchange mailbox stores on NTFS volumes. Use Encrypting File System （EFS） to encrypt the stores
C. Use the internal certification authority （CA） to issue certificates to all employees. Require employees to digitally sign outbound e-mail
D. Use the internal certification authority （CA） to issue certificates to all employees and vendors. Instruct employees and vendors to use secure MIME to encrypt all e-mail sent between them
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