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问题 单项选择题

在R/SVHF通信系统的RCMS监控系统中，如果某信道人工选择A机或B机主用，则另一部电台的状态是（）。

A.SBY  OFF

B.REM  ON

C.REM  OFF

D.LOC  OFF

答案

参考答案：C

单项选择题

Currently 94%of Web users use either Internet Explorer or Firefox．but recently somenew (71) have been developed that are beginning to attract attention．The browser Opera isbecoming very (72) because of its speed，it is currently the world’S fastest browsec andbecause it is much smaller (73) existing browsers(it can almost fit on a single diskette)．It canalso (74) the last web page you visited，so the next time you surf,you can start where you leftoff．And like the big two，you can get it for free；the catch is that you have to watch blinkingads in one comeL orpay$40 forthe ad—free (75) ofOpera．

A．beyond
B．SO
C．than
D．as
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单项选择题

SS4型电力机车牵引控制柜中电子插件分板测试，短路保护板测试时（注意：短路保护动作后，应马上断逆变电源，否则会烧损插件），（）分析是错误的。

A、波段开关置“l”位，调W2使继电器可靠吸合，且恰好无振荡声，脉冲封锁灯亮

B、断逆变开关，波段开关置“2”位，合逆变电源，主断灯亮，脉冲封锁

C、波段开关置“3”位，合逆变电源，主断灯亮，脉冲封锁

D、波段开关置“4”位，合逆变电源，主断灯亮，脉冲封锁
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