天线的增益大小可以说明()。A、天线对高频电信号的放大能力 B、天线在某个方向上对 发布时间:2017-05-07 06:55 │ 来源:www.tikuol.com 题型:单项选择题 问题: 天线的增益大小可以说明()。A、天线对高频电信号的放大能力B、天线在某个方向上对电磁波的收集或发射能力强弱C、对电磁波的放大能力D、天线在所有方向上对电磁波的收集或发射能力强弱
题型:单项选择题 出境口岸检验检疫机构根据需要可以对电子转单的那些信息进行更改( )。A.变更申报总值幅度不超过10%的B.更改运输工具名称、发货日期、集装箱规格及数量的C.因某些原因短装的D.增加发货数量或重量的 查看答案
题型:单项选择题 Hearing the news that he had been ______as general manager of the big company, he ______ with excitement and joy, forgetting that he was showing some visitors around. A.named; broke outB.appointed; eruptedC.made; was filledD.chosen; was full 查看答案