示波器用示波管，按使电子束发生偏转的方法分类，可分为（）示波管和（）示波管。
参考答案：垂直；水平
哪一年夏初之际，长沙高新技术产业开发区在湘江西岸正式亮相？
How can the SART’s audible tone monitor be used?（）
A.It informs survivors that assistance may be nearby
B.It informs survivors when the battery's charge condition has weakened
C.It informs survivors when the SART switches to the standby mode
D.It informs survivors that a nearby vessel is signaling on DSC
