LLC是一种基于高速数据链路规程HDLC的无线链路协议,能够提供高可靠的加密逻辑链路。
A. 正确
B. 错误
电话会议是一种以语言交流为手段的会议形式,无法实现文字的同步传输,因此需要()。
A. 派出人员具体组织安排
B. 配置视频设备
C. 做好会议报到工作
D. 提前做好会议书面信息的分发工作
三相异步电动机转子不动时,经由气隙传递到转子侧的电磁功率全部转化为转子铜损耗.
A. 正确
B. 错误
You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?().
A. Your speed must be reduced to bare steerageway
B. A look-out is not required if the radar is on
C. Fog signals are only required when a vessel is detected by radar
D. The radar should always be kept on a short-range scale