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（）。
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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
调度综合台帐是为反映生产活动为目的而建立的。（）
A. 正确
B. 错误
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