下述关于操作系统中，错误的是（  ）。 A.
操作系统中存储管理是指对外存储器资源的管理 B.
文件管理是操作系统中用户与外存储器之间的接口 C.
操作系统中设备管理是指对所有外部设备的管理 D.
操作系统是软件系统的核心

单项选择题心室肌细胞的生物电活动下述哪项是错误的 A、0期去极为Na＋内流 B、复极1期为K＋外流 C、复极3期为K＋外流 D、4期有K＋外流

单项选择题【单选题】Which of the following statement on providing your contact details in an order confirmation email is NOT true? _______ A. Always provide information on how the customer can contact you. B. It’s stupid to make this information readily available, in case of calling from customers. C. It’s smart to make this information readily available, in case of emergencies from customers.. D. Once you’ve identified the right information to incorporate into the email, you’d better prepare and sent the order confirmation email as quickly as possible.