某国内航行近海航行的客滚船，载客1500人，设计单位对该船无线电设备的配备设计如下，请判断哪些是正确的：（）
A．为了方便遇险报警的发送，在该船应在驾驶室设置一个遇险报警板，该报警板上应设置一个或数个按钮，当按下按钮时，船上所有具有遇险报警功能的无线电通信装置发出遇险报警。如果卫星通信设备设置在驾驶室，在该设备上具有遇险报警按钮，可不要另设遇险报警按钮。
B．为了方便通信，该船配备了中高频无线电装置，并具有DSC功能，为了满足法规，该船的中高频装置还应配备NBDP终端。
C．船上的GPS应与无线电发信机相连，以便在发送遇险报警时，能自动和连续地将船舶位置资料传送至无线电发设备，即遇险报警中包括位置信息。
D．该船应配备2只雷达应答器，另外船上配备的救生筏应每4只配备一个雷达应答器，并安装在救生筏中。
参考答案：C, D
| Electronic mail has become an extremely important and popular means of communication. The convenience and efficiency of electronic mail are threatened by the extremely rapid growth in the volume of unsolicited commercial electronic mail. Unsolicited commercial electronic mail is currently estimated to account for over half of all electronic mail traffic, up from an estimated 7 percent in 2001, and the volume continues to rise. Most of these messages are fraudulent or deceptive in one or more respects. The receipt of unsolicited commercial electronic mail may result in costs to recipients who cannot refuse to accept such mail and who incur costs for the storage of such mail, or for the time spent accessing, reviewing, and discarding such mail, or for both. The receipt of a large number of unwanted messages also decreases the convenience of electronic mail and creates a risk that wanted electronic mail messages, both commercial and noncommercial, will be lost, overlooked, or discarded amidst the larger volume of unwanted messages, thus reducing the reliability and usefulness of electronic mail to the recipient. Some commercial electronic mail contains material that many recipients may consider vulgar or pornographic in nature. The growth in unsolicited commercial electronic mail imposes significant monetary costs on providers of Internet access services, businesses, and educational and nonprofit institutions that carry and receive such mail, as there is a finite volume of mail that such providers, businesses, and institutions can handle without further investment in infrastructure. Many senders of unsolicited commercial electronic mail purposefully disguise the source of such mail. Many senders of unsolicited commercial electronic mail purposefully include misleading information in the messages’ subject lines in order to induce the recipients to view the messages. While some senders of commercial electronic mail messages provide simple and reliable ways for recipients to reject (or ’opt-out’ o0 receipt of commercial electronic mail from such senders in the future, other senders provide no such ’opt-out’ mechanism, or refuse to honor the requests of recipients not to receive electronic mail from such senders in the future, or both. Many senders of bulk unsolicited commercial electronic mail use computer programs to gather large numbers of electronic mail addresses on an automated basis from Internet websites or online services where users must post their addresses in order to make full use of the website or service. The problems associated with the rapid growth and abuse of unsolicited commercial electronic mail cannot be solved by the government alone. The development and adoption of technological approaches and the pursuit of cooperative efforts with other countries will be necessary as well. |
"Opt-out" mechanism is probably ______.
A．a machine that can be attached to your computer
B．a button that you can make a choice to read or not to read
C．a software that you can play a computer game
D．an e-mail that says some good words to you