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

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

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.

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

计算机病案信息系统

西方哲学史分为（）个时期.