在发射机的输出端加高精度的滤波器,滤去其它发射机来的信号,或加环形器等非可逆电路,避

题型:单项选择题

问题:

在发射机的输出端加高精度的滤波器,滤去其它发射机来的信号,或加环形器等非可逆电路,避免其他信号漏进来,其目的是()。

A.减轻邻道干扰

B.减轻发射机互调干扰

C.减轻其他外界干扰

D.减轻接收机互调干扰

考点:铁路通信工技能考试无线列调通信工无线列调通信工题库
题型:单项选择题

儿童时期来源于肾上腺的恶性肿瘤常见的是()

A.血管瘤

B.错构瘤

C.神经母细胞瘤

D.皮质畸胎瘤

E.腺瘤

题型:单项选择题

请从A、B、C、D、E、F六个选项中选出五项与1-5题中的描述一一对应。

“低碳生活,从我做起!”请仔细阅读下列材料,找出以下五种“低碳”行为产生的直接效应。

A. Saving electric energy              B. Protecting(保护) forests

C. Saving water                      D. Protecting animals

E. Producing less air pollution          F. Protecting plants

小题1:Henry often recycles water to clean his room and water the flowers.

小题2:Daphne always turns off the lights and the computer as soon as she leaves her office.

小题3:Mr. White sometimes goes to work by bus or on foot instead of driving his car.

小题4:Li Lei usually uses QQ or emails to communicate with his friends instead of paper letters.

小题5:Miss Zhang never wears fur clothes and she decides to eat less meat.

题型:单项选择题

动脉导管未闭的手术中,最容易损伤的神经是()

A.交感神经

B.迷走神经

C.膈神经

D.喉返神经

E.肋间神经

题型:单项选择题

计算机病案信息系统

题型:单项选择题

西方哲学史分为()个时期.

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